Winix HR900 Ultimate Pet Air Purifier Review – Got Pets & Need Relief? It’s A Winner!

Winix air purifiers are some of the best I’ve had the pleasure to own and test. In fact, in my review of the wonderful Winix 5500-2 purifier I rated it as one of the best I’ve ever used – so much so it quickly became one of my favorites!

But what if you’re dealing with pet dander, hair, odors, and even allergies? In my hands-on review of the Winix HR900 Ultimate Pet you’ll find out all the details and if it’s a good buy.

Getting to know the Winix HR900 Ultimate Pet air purifier

Winix pet air purifier models comparison diagram

The Winix HR900 is one of several models in the manufacturer’s line of home air purifiers. It shares many features & design elements from the older (and now discontinued) WAC-9500 Ultimate Pet purifier.

While they’re not one of the most popular manufacturers of home air products today, without question the South Korean company Winix makes some of the best air purifiers I’ve had the pleasure to own & test.

Winix has a relatively small line of air purifiers with similar features, some which are industry-leading. However, there are definitely some important differences to know before buying. Not to worry as I’ll be sure to explain more as we go!

The HR900 and its siblings the 5500-2 and the lower-cost 5300-2 share several common features:

  • Removable front filter (magnetic latches) and easy filter maintenance
  • PlasmaWave ionizer/air cleaning electronics
  • Auto-sensing air quality automatic operation with visual indicator
  • Soft-button electronic controls
  • Light sensor for ultra-quiet/dimmed overnight use
  • Air quality sensor(s)
  • Washable pre-filter screen
  • True HEPA filter
  • Odor/vapor filter
  • Very quiet operation
  • Self-off timer
  • Industry-standard Clean Air Delivery Rate (CADR) ratings are provided

Unlike the 5300-2, however, the 5500-2 and the HR900 offer a much more robust Advanced Odor Control (AOC) odor and airborne vapor filter which uses real carbon pellets.

That’s a distinct advantage over the 5300-2 and other purifiers sold today. Most use a weaker activated carbon coating on the prefilter instead of real solid activated carbon pellets.

You can expect to pay around $265 or so for the HR900. The 5500-2 and 5300-2 sell for around $250-$200 or so, depending.

Additional air cleaning features the HR900 for pet problems

The HR900 goes one step further with the use of a third filter just for pet hair and dander. Included in the box are 12 of these thin, replaceable filters which attach to the pre-filter. You’ll have enough for at least 1 year of use, if not more.

Pet odors are covered, too, as there’s not only the great odor control filter performance but an odor sensor for automatic fan speed control as needed.

The discontinued Winix WAC-9500 Ultimate Pet purifier

Winix WAC-9500 Ultimate Pet purifier product image front viewThe Winix WAC-9500 Ultimate Pet purifier, shown here, was the earlier model to the HR900. It shares many of the same design features but with a different style and control panel.

The HR900 model isn’t a completely new design. In fact, it’s quite similar to the older and excellent WAC-9500 that’s now discontinued. I’ll cover the minor differences later.

Unpacking & first impressions


Image showing unboxing the Winix HR900 Ultimate Pet air purifier

It’s here! I’m always excited to try a new purifier and my HR900 was no different. I got to work right away unpacking it and checking it out up close. It’s securely packed using styrofoam, although I would prefer recyclable corrugated cardboard if possible. So far, so good though!

My Winix HR900 arrived and I got to work unboxing it right away! The purifier is securely packaged and held in place using styrofoam inserts.

The owner’s manual is located right on top so it’s impossible to miss it when opening it up. Unlike some other brands, however, there’s no quick start guide or customer service contact information printed on the box flaps.

That’s not really a complaint, however, as there’s plenty of helpful information included anyway.

The HR900 is a bit big and heavy so you’ll need to carefully remove it from the box using the built-in handle on the rear.

Getting it out and ready

Winix HR900 air purifier removing protective plastic examples

After unboxing the purifier you’ll need to remove the plastic bag and the protective plastic covering the control panel. You’ll also need to prepare it for use by opening the front cover and removing the filters from their bags.

After unboxing I had to remove the plastic bag and a thin sheet of protective plastic covering the controls. As mentioned in the owner’s manual it’s necessary to prepare the filters too.

In the case of the HR900, you’ll also need to attach a pet filter to the washable pre-filter screen as well. I’ll cover those steps in the filter section.

To set up your new purifier you’ll need to remove the filters from their plastic bags before use. That’s because they’re shipped in sealed bags to keep them fresh before use.

What’s included?

Winix HR900 air purifier included items image

Included in the box are the following:

  • The owner’s manual
  • A 12 pack of Ultimate Pet filters (12 month supply)

I’m a bit disappointed that unlike my 5500-2 model there’s no Quick Start Guide included. However, it’s not a big deal as the instructions are very clear and easy to follow.

Additionally, the pet filters included a very helpful instruction sheet inside the bag so you’ll be ready to go in no time.

Unlike the 5500-2, there’s no remote control included. While it may seem nice to have one, in practice I really haven’t missed it very much.

After setting up the purifier I got to work inspecting the build quality & fit & finish up close.

Build quality and fit & finish

Winix HR900 air purifier close up build quality images

The HR900 has a low-gloss white finish with silver or gray color accents for the control panel inlay and side vents. The control panel is well-done and clearly labeled. Quality is excellent and the air purifier is well-built with no issues.

After opening and unpacking it (and setting it up initially, which is just a few steps as I mentioned earlier) finally I got to turn it on and use it!

The HR900 is well designed with a low-gloss white finish and silver and metallic gray inset to contrast the white color. While white is not my first choice (the 5500-2 and 5300-2 models are black and gray, respectively) I have to admit it looks good.

Overall impressions and manufacturing quality

As I inspected the assembly, finish, and overall construction, I found the Winix HR900 to be well-made with no defects and nothing to imply poor quality or problems. It’s a high-quality purifier with a solid fit and finish.

Parts are put together nicely: Body panels line up very well, and there aren’t any gaps. Just like the other Winix purifiers I’ve owned its top-notch quality. Very well done!

If there’s one thing I’ve learned over the years, it’s that gaps and misaligned parts are a sign of build issues. I’m happy to report you won’t find that here – only a well-made purifier that looks great right from the get-go!

Controls and how to operate it

Diagram showing the Winix HR900 touch control functions & features. Even though it might look complicated at first glance, it’s actually very easy to use. Just push the Mode button to switch between Auto or 1 of 4 fan speeds (in addition to Sleep mode). Activate the auto-off timer using the Timer button. 

Using the HR900 is simple. In the picture above, you can see the touch controls, each with a label:

  • Mode button: Sleep, Auto, low, medium, high, and Turbo modes
  • Control panel lock on/off (child lock)
  • Reset button (not normally needed)
  • Check filter indicator
  • Timer function/hour select (1, 4, & 8 hours selectable)
  • Power on/off
  • PlasmaWave on/off

The controls are nice and work well – they’re not too sensitive and don’t need a hard touch, either. I found them reliable, clear to understand, and straightforward in everyday use.

My impression is that some good engineering design went into making this model. What I don’t like, however, is that it uses black text on a silver inlay for the control panel labels. That’s in contrast to the 5500-2 and 5300-3 models which use light text & symbols on a dark inlay which I found easier to read.

Just the same, though, it’s still good-looking and easy to understand.

Button & control illumination

While the buttons themselves aren’t illuminated, active options or working modes are. 

For example, The PlasmaWave logo is illuminated when active, “1hr” is lit when the auto-off timer is set to 1 hour, and the current fan mode option is lit as well.

It’s a bit inconvenient to not be able to see the buttons themselves in a darkened room, but so far it has only been a small annoyance in my opinion.

Fan speeds and special modes

It’s easy to switch modes and fan speeds. Just push the fan speed button to cycle through the speeds (Turbo is the highest and is a special powerful mode). As the unit originally powers up it’s already set to Auto and the lowest fan speed.

Once it’s in Turbo mode pushing it yet again puts it back in Auto mode.

The modes change in the following order:

  1. Auto (default at power on)
  2. Sleep
  3. Low
  4. Medium
  5. High
  6. Turbo
Note: By default, the purifier will start in Auto mode and low fan speed when first powered up.

Using the auto-off timer feature

Winix HR900 air purifier timer button use example image

Shown: The auto-off feature lets you use a convenient timer with one of 3 settings to turn it off automatically. Just push it to cycle through 1, 4, or 8 hour delays at any time. Continuing to push it will cycle back to turn the timer off. It’s a great feature I really like.

One feature I really like – which many purifiers don’t include – is the auto-off timer. With it, you can set the air purifier to run for several hours and then power off by itself. Very convenient!

To use it, just push the Timer button and cycle between 1 of 3 hour settings (1, 4, and 8 hrs).

Push it again at any time to rotate back through the settings and turn if off it when you like.

Child lock feature

Winix HR900 child lock button example

To prevent your little ones from messing with the purifier’s controls the child lock button can be used. Just push and hold for 3 seconds to lock the controls to their current state. The indicator will light to show the controls are locked.

Also found in a competitor’s model (the smaller Levoit Core 300), the child lock feature lets you prevent any unwanted curious fingers from changing settings.

To switch it on, just push and hold the button for 3 seconds. The indicator will show a red color to let you know the controls are locked and can’t be changed, but they’ll stay at the current settings you’ve last used.

Repeat that again to return the controls to their normal use.

How the built-in sensors work + auto mode explained

Winix HR900 air purifier sensor location diagram

The HR900 includes a smart design with a wonderful self-adjusting operation. To do so, it uses 3 built-in sensors: 2 on the left side of the control panel and a 3rd on the right side of the body. Two of these are air quality detection sensors and the 3rd senses the room’s light level.

As I mentioned at the start of my review, the purifier has an advanced design and allows self-adjusting operation. This works thanks to the use of 3 sensors built into the unit:

  1. Odor sensor
  2. Dust sensor
  3. Light sensor

The odor and light sensors are located on the top of the unit on the left side and can’t be serviced. You’ll find the dust sensor on the right side of the unit with a removable cover. According to the owner’s manual, occasional cleaning is recommended (it’s easy, don’t worry!).

How air quality sensing and auto operation works

The HR900 measures air quality (both odors and particulate levels) and shows you the current detected air quality condition using the front panel 3-color light. This works in both manual or Auto modes, by the way.

When the Mode button is set to Auto mode, the purifier will adjust the fan speed automatically as needed for the current air quality situation. Very cool, and a great feature I love!

In my experience and during everyday testing it works very well! Despite what you might think, it does so gracefully and the fan adjusts slowly and without any kind of “jarring” behavior or excessive noise. I can’t say the same for some lower-priced competitors.

Winix HR900 dust sensor cover removal example

The dust sensor, on the right side, can be accessed for cleaning occasionally. This helps make sure you’ll keep the purifier’s performance at its best.

You’ll not likely even notice it’s working, aside from the occasional slightly more noticeable fan sound (it’s an extremely quiet purifier).

In Auto mode the light sensor is used to detect when the room darkens. After a while the air sensor indicator light will turn off and the purifier will go into the ultra-quiet low fan mode.

It’s great for night use and works very well, in my experience. (You’ll just need to understand that it doesn’t go into Sleep mode immediately – there’s a delay before it changes modes.

Occasionally you may want to run the fan manually at say the high or Turbo speeds. For example, if there’s an immediate pet odor, dander, or airborne hair problem. However, most of the time Auto mode does the job very well.

Understanding the air quality indicator light

Winix HR900 air purifier air quality indicator light examples

When it’s turned on the purifier will use one of 3 colors to show you the current air condition it detects:

  • Blue (good air quality)
  • Amber (fair air quality)
  • Red (poor air quality)

The light uses an LED design but it’s not at all too bright, in my opinion. It’s definitely bright enough to be seen across the room, but not at all “glaring” in a darkened room. Again, you won’t have to worry about the light when sleeping if Auto or Sleep modes are used.

In that case, the light is turned off automatically in a darkened room (or when Sleep is manually selected).

Understanding the Winix HR900 blinking blue light

One thing I noticed when using the purifier which I hadn’t seen on other models was a blinking blue light after starting it up.

According to the owner’s manual, this only happens once during power-up and it means the purifier is measuring air quality:

During the first 4 minutes of power up, the Air Quality light will flash as the Smart Sensors measure the air quality in the
environment, after which normal operation will begin.Winix owner's manual

Turning off the air quality light

You can also switch off the light anytime you like. To do so, just push and hold the Timer button for 3 seconds. Do it again to restore it.

That’s a great feature if you get annoyed by the air quality indicator.

However, there’s no way to totally switch off the control panel lighting. At least 1 indicator backlight (the Sleep logo) will be on during Sleep mode. In my everyday use, however, that wasn’t a nuisance for me.

I’ll cover dark room brightness later in another section below.

Using the PlasmaWave feature

Winix HR900 PlasmaWave use example

When the PlasmaWave feature is in use the logo glows with white light. By default, it’s switched on at power up.

To use the PlasmaWave feature just touch the on/off button. You’ll know it’s working as the logo will illuminate when it’s on. (Keep reading as I’ll cover this feature in more detail as we go.)

Control panel chime sounds

The purifier has some unique chime sounds used as feedback when a button is pushed, power is turned on, or when it’s powered off.

Each touch of a button gives a gentle chime sound, which is actually pretty pleasant to hear – not at all harsh or annoying like some other products I’ve tested. When turning it off or on, you’ll hear a series of chimes for a moment, sort of like a short musical tone.

However, there’s no way to switch the sounds off if you prefer silent button use.

I’d prefer the option is available, though, and I don’t know why it was overlooked. So far I’ve not found it to be a problem, however.

The sound tones are very similar to those used by the 5500-2 and the 5300-2 models as you might expect.

Specifications & CADR ratings

This is box title
  • Room size coverage: 300 sq. ft.
  • 4-stage filter system: True HEPA, activated carbon filter (AOC), prefilter screen, pet filter
  • Washable prefilter screen & odor control filter section
  • Replaceable pet filter for enhanced hair and dander control
  • Fan speeds: Low, medium, high, turbo
  • PlasmaWave electronic air cleaning feature
  • Electronic touch control panel
  • Child lock feature
  • Auto-off timer: 1, 4, 8 hr options
  • AHAM Certified performance ratings
  • Clean Air Delivery Rate (CADR): 194/200/220 (smoke/dust/pollen)
  • Air sensing technology with auto operation
  • Air quality sensors (odor, dust) & light sensor
  • 3-level air quality indicator light
  • Automatic Sleep mode option with dark room sensing
  • Ultra-low noise Sleep mode
  • Filter maintenance indicator light
  • Filter life: 1 year (true HEPA & AOC odor filter)
  • Pet filter life: 1 month (12 month supply included)
  • Main replacement filters: Winix type T set (true HEPA + AOC)
  • Pet filter replacement: Ultimate Pet filter pack
  • 2 year warranty
  • Power use (Watts): 0.7, 4.3, 7.8, 10.2, 13.9, 46.6
  • Weight: 18.7 lbs
  • Size: 9.6 × 16.3 × 23.6 in”

If you’re not already familiar with it, the Clean Air Delivery Rate (CADR) is an industry-standard way of testing and determining an air cleaner’s effectiveness.

Winix HR900 CADR ratings label

The HR900’s CADR ratings are shown here. They’re printed clearly on the box as well!

What is a CADR rating?

The Association of Home Appliance Manufacturers (AHAM) is an organization that verifies the functionality and performance of home appliances for the industry. CADR rating tests are voluntary and not required by law.

CADR ratings are numbers used to help you know an air cleaner’s performance before buying. The rating numbers are based on “higher is better.”

In order to find out how well an air purifier cleans the air, 3 types of tests (smoke, pollen, and dust) are performed in a controlled lab environment and the performance is graded.

One thing I really like about the HR900 is that while they don’t have to offer these specifications, it’s really helpful. It’s very useful for comparing similarly rated air purifiers when shopping.

In the case of the Winix the CADR label is printed right on the box.

How it compares

Winix HR900 CADR label on box closeup

For comparison purposes, consider that many of today’s most popular air purifiers (small-medium room models) have CADR ratings of around 100. The HR900, by contrast, has 194-220 depending on the particular air quality test. That’s very good!

However, it’s a bit lower than its sibling the 5500-2 which has ratings of 232, 243, and 246. While that means it’s slightly less effective, consider that the 5500-2 is rated for 360 square feet sized rooms vs the 300 of the HR900 – meaning it has higher airflow.

Additionally, the 5500-2 lacks the dust sensor of the HR900 meaning it has less effective auto-sensing operation as well.

The HR900 has more effective air cleaning for pet dander and hair than the 5500-2 & 5300-2 do too, as those don’t include the pet filter option.

Thoughts on the 5500-2 size & weight

Winix HR900 purifier heigth measurement

At around 23 1/2 inches tall, it’s reasonably sized in my opinion.  As it uses fairly large filters to clean the air well, naturally it’s not what you’d call a “compact” air purifier.

At almost 19 lbs in weight, it’s not quite as easy to move around as some other products. However, that also means it’s less likely to get tipped over.

Carrying the purifier

Winix HR900 carrying handle use example

The purifier features a built-in handle on the rear as well. You’ll still want to use 2 hands, however, as it’s a bit bulky and slightly heavy.

Just like with other purifiers from the company I’ve tested, there’s a convenient carrying handle (and opening for your fingers) at the rear top of the body. It works pretty well, but since the HR900 is a bit larger and heavier than its counterparts you’ll still want to use 2 hands.

I found it helpful to use the carrying handle and hold it at the front when moving it. That helps with avoiding dropping it or banging into walls or furniture by accident.

It’s a bit deeper

Winix HR900 purifier depth measurement

Additionally, one thing I noticed right away about the HR900 is that it’s slightly deeper than the 5500-2 and 5300-2 models. At 9 inches deep, it’s only around 1 inch larger from front to back.

For some reason, though, I noticed it more on this model (likely due to the white color and body shape). One reason for the extra size is the additional filtering used. Otherwise, it’s still fine and I’m not complaining!

HR900 power use measurements (Watts)

Winix HR900 air purifier power measurements in Watts diagram

One of my single biggest gripes about home air quality products like fans, air purifiers, and humidifiers is the lack of good information about their energy use. Those that do give power ratings often only list the largest power use, not for the other settings. That’s a shame, as you’ll be more likely to use the other settings.

To find out exactly how much power the purifier uses I measured it for all settings using my trusty Kill A Watt meter.

Mode/Speed Power Use (Watts)
Off 0.7
Sleep 4.3
Low 7.8
Medium 10.2
High 13.9
Turbo 46.6

It’s easy to see that the purifier uses only a handful of watts on all but the highest settings! It’s one of the most energy-efficient models I’ve tested.

In case you’re wondering, with the PlasmaWave feature turned on there’s only a small increase in power use (0.3W). That’s in contrast to other brands & models like the GermGuardian AC5250PT with UV-C feature which uses an extra 5W with the feature on.

In fact, it’s an Energy Star rated appliance although you might not be aware. For some reason the company doesn’t use labels on the box or in some product listings as their competitors do.

Air cleaning ability + more about PlasmaWave

Winix HR900 PlasmaWave product feature image

I was unsure about what the PlasmaWave feature actually does as sadly there aren’t really any details in the manual or the manufacturer’s website.

In most cases, air purifiers with a feature of this type use one or more variations of ionizer technology to give a extra air cleaning. (In contrast to models with ultraviolet light, these use an electric charge to affect ions in the air as it works).

According to the company:

PlasmaWave® Technology safely breaks apart odors, allergens, chemical vapors, and other pollutants at the molecular level, without causing harmful ozone. PlasmaWave® creates positive and negative ions that combine with natural water vapor to form hydroxyls which clean the indoor air.Winix America

It works using an ionizer type of device to affect molecules in the air to have them attach to airborne particles and remove them. While it’s a nice extra feature to have, don’t expect it to have a big impact on the air.

In all air purifiers, the real work is done by the pre-filter and the HEPA filter.

What’s it like in use?

Winix HR900 air purifier PlasmaWave logo glowing example

You won’t hear a noise or smell anything when the PlasmaWave feature is turned on (it’s set to on from the factory but can be turned off at any time).

In fact, if not for the illuminated logo you’d forget it’s turned on at all.

Air cleaning performance

Winix HR900 pet filter section dirty closeup example

It’s a bit hard to see due to the material it’s made of, but after use the pet pre-filter clearly had captured pet hair, dust, fuzz, and other nasty elements in the air.

As I did with the Winix 5500-2, I tested the HR900 for several things – most importantly good old-fashioned use within my home with a pet. There’s a lot to be said for putting a product through its real-world paces rather than a “perfect” environment.

That’s because there’s a lot that can get missed – both good and bad – by not evaluating how you’d really use it every day.

What I found during use

Much like the 5500-2 with the same type of Advanced Odor Control (AOC) filter, the HR900 did a great job of capturing odors, pet hair and pet dander. During testing I used in several modes:

  • Sleep
  • Auto
  • Manual: Low, Medium, High, and occasionally Turbo mode

Without a doubt, the odor control & vapor absorption ability of the HR900 is some of the best I’ve used to date. Air cleaning is very good and the auto-adjusting fan speed control works very well!

The HR900 did a great job of cleaning both pet hair (my biggest gripe), odors, dander, microscopic dust, and other particles.

New vs dirty HEPA filter comparison example

Before and after: The HR900’s clean HEPA filter vs the dirty condition after using it for some time. Notice the medium-gray color now seen on the filter. That’s from trapping minute & microscopic particles of all types over time. It works very well!

All in all, I’ve been very happy with the HR900. One of the best things I like about it is the low noise operation in all modes aside from Turbo.

One of the reasons is that while the purifier uses a very powerful circular fan, the fan noise I heard was very “soft” and less noticeable to the ears. It’s like a gentle white noise I didn’t mind at all.

Other models I’ve tested with a powerful fan are far more noticeable when running and don’t sound nearly as good, having a “harsher” sound they produce.

Testing auto mode

I’ve noticed that when in Auto (auto-sensing) mode it works well but has a slight delay before the fan changes speeds. I assume that’s intentional to prevent it from constantly moving between fan speeds due to sudden air quality changes.

For example, I tested the air quality sensing and auto mode by using a regular paper match. The HR900 was able to sense the strong odor in the room, changed the air quality indicator light to red (to show it was sensing poor air quality at that moment), and then increased the fan speed until the smell was greatly reduced in the air.

It’s a really great feature and I’m sure you’ll enjoy it just as much as I did. While a feature like this is only found only somewhat more expensive models like this one and the Levoit LV-PUR131, it makes everyday use a breeze.

Again, as I mentioned earlier, the HR900 detects not only odors but dust & other particles as it has a 2nd sensor that other products don’t.

Room size and square feet coverage

Winix HR900 air purifier square feet coverage example diagram

The HR900 is recommended for medium to large rooms up to about 300 square feet (29.9 square meters).

As an example, that’s a room about 15 by 20 feet in size (about 4.6 x 6.1 m). That’s roughly 2x the room size coverage of some of the most popular purifiers, many of which are rated for medium sized rooms.

Additionally, the lower priced purifiers are recommended for rooms no bigger than 155 sq. ft. or so.

Note: It’s perfectly fine to use the Winix purifier in a smaller room – in fact, you’ll get even faster air cleaning as it will be able to cycle the air more times per hour.

Winix HR900 air purifier placement recommendation

Be sure to pay attention to the recommended purifier placement within the room where it’s used. The manual included spacing advice.

One more thing: You’ll need to be sure to avoid putting it too close to a wall or blocking the purifier from having enough room for proper airflow.

Just like other products, you’ll need to leave the recommended amount of space around it: 12-18 inches behind and in front, and 4 inches at least around the sides. That’s so it can move air efficiently to cycle the room’s air and clean it optimally.

Does the HR900 produce ozone?

Traditional air purifiers which use HEPA filters are safe and don’t produce ozone. A good purifier works by removing elements and odors in the air, not by adding by-products to the air as it works.

The Winix HR900 does not produce ozone.

In fact, Winix America is verified by the Air Resources Board (ARB) verification to meet federal ozone emission limits (in this case, basically zero emissions).

Filters, upkeep, and maintenance costs

Winix HR900 filter sections illustrated

Shown: The 4 filters used: (1, 2) A permanent pet filter is used to catch larger elements like dust, pet hair, dander, and more. This sticks on to the washable pre-filter section which also captures larger elements. (3) The Advanced Odor Control (AOC) filter uses a unique design containing real activated carbon pellets inside a honeycomb-style frame. It lasts for 12 months and traps odors as well as chemical & other vapors. (4) The true HEPA filter traps super-fine particles, pet dander, dust mites, and much more down to microscope sizes that the pre-filter sections can’t.

As I mentioned at the beginning, 4 types of filters are used:

  1. Pet filter (attached to the washable pre-filter)
  2. Washable (permanent, reusable) prefilter
  3. AOC odor control filter
  4. The High Efficiency Particulate Air (HEPA) filter

1. The pet filter

Winix HR900 image showing how to apply the pet filter

This section is made of thin, soft material that traps pet hair and other large airborne problems. As it attaches to the pre-filter, it’s a permanent filter that has to be replaced periodically (see my notes about maintenance further below).

While it works really well, it is slightly a hassle when you first try attaching one to the frame of the pre-filter. It’s easy to misalign the self-adhesive tape that comes attached to it when sticking it on the pre-filter frame.

Winix HR900 pet filter closeup image

The pet filter is unique to the Winix pet purifier and is made of a soft, thin, fibrous material with self-adhesive tape attached.

There are 4 sections of self-adhesive tape (left, right, top, and bottom) to apply.

They’re easy to remove, however, when replacement time comes around. As the purifier includes a 12-month supply, you’ll be all set for quite some time! I do like very much how they included enough pet filters to match the 12-month life expectancy of the HEPA and AOC filters.

2. Reusable (washable) prefilter

Winix HR900 washable pre-filter closeup image

Just like other Winix models, the pre-filter included is made of a plastic frame and fine mesh material. It can be cleaned by brushing, vacuuming, and rinsing under clean water.

The prefilter is unique in that instead of being built being coated with the odor-absorbing chemical most brands (and the 5300-2 model) use, it’s a single reusable screen you can easily remove and wash.

It helps to extend the life of the other 2 if you do so, by the way (14 days is the recommended check/wash interval, although the filter reminder does not cover this filter too). You’ve got several options for cleaning it: Brushing, vacuuming, and rinsing it under clean running water. It’s an option that I wish more products provided.

However, in my experience, the pet filter does most of the first filtering work and will keep the pre-filter clean. That means ultimately you won’t need to clean the pre-filter often or at all and will simply need to replace the filter at the recommended times.

3. High-performance AOC odor & VOC filter

Winix HR900 AOC odor filter closeup

The Advanced Odor Control filter is a long-life odor control section made with real activated carbon pellets. That’s very different from most which use a lightweight coating on the pre-filter section itself. It’s an excellent performer!

As I mentioned earlier, the AOC odor control filter is one of the best I’ve used. It’s a bit different than what most air purifiers (and the Winix 5300-2 as well) use.

The frame is much like a honeycomb, made up of small “cells” in which real, solid activated carbon pellets are held loosely. That’s very different than the thin coating most use directly on the pre-filter material.

While you might be thinking it’s only there to help with odors, it isn’t. In fact, it’s helpful for trapping volatile organic compounds (VOCs) and chemical substances in the air that can cause both discomfort, headaches, and even health problems.

Cleaning options

Winix recommends removing the AOC filter and rinsing it with room temperature water every 3 months or so to prepare it for more use (up to the 12 month life rating). Don’t use any type of soap or cleaning products.

4. HEPA filter

Winix HR900 HEPA filter closeup

Finally, there’s the true HEPA filter. Based on the industry-standard HEPA filter specification, it’s a folded section made of highly dense fibers that can capture 99.97% of all particles down to 0.3 microns (less than 1 millionth of a meter) in size. 

In fact, that’s so small you’d need a microscope to see them. Anything that the pre-filter and pet filter sections don’t trap is captured by this. Mine works very well and it’s amazing to see how much it’s trapped!

Just like with the AOC filter, the estimated filter life is around 12 months. That’s good in my opinion, as many lower-cost products have an estimated filter life around 6-8 months or so.

However, please note if you’ve got a particularly nasty air problem in your home the filter life may be shorter. There’s a convenient pull tab on top of the filter as well as an arrow & label showing the proper installation direction. Those are nice touches I really like.

Maintenance notes

As I mentioned in the control panel section, there’s a filter reminder that lights after 3 months to let you know it’s time to check the filters. Here’s the maintenance schedule as listed in the owner’s manual:

Filter Indicator light When to clean When to replace
Pet filter N/A N/A Monthly/as needed
Pre-filter N/A Clean every 14 days (Permanent filter)
AOC carbon filter Check filter light Clean every 3 months 12 months
HEPA filter Check filter light N/A 12 months

Ultimately, you want to check the filters, and, depending on your needs, they may or may not need cleaning. The AOC odor-absorbing carbon filter and the HEPA filter last up to about 12 months then they’ll need replacement.

For best results, the company recommends rinsing the AOC filter under clean water every 3 months and similar for the washable prefilter every 14 days. Maintenance is pretty easy to do and I found it pretty simple as well.

When using my Winix purifiers I’ve had a lot of dust build up on the filter sections so I simply rinsed off the pre-filter and odor filter to remove it. I shook off the water and let them air dry as recommended before reinstalling them.

Replacement filters & maintenance costs

Winix type T replacement HEPA filter set product image

As it’s pretty new to the market, at the time of this post prices haven’t “settled” for the filter set it uses: Type “T” filter set.

Currently it’s only available at the manufacturer’s site but once it’s available at Amazon you can expect to pay around just over $60 for the set. Note that while it looks very similar, the Type H set for the 5500-2 model does not fit the HR900 (they’re close but slightly different).

While $60+ might sound like a lot of money, considering the great air cleaning performance you get it’s well worth it in my opinion. That’s around only $6/month or so for better health and clean, fresh air along with pet odor, hair, and dander relief.

Winix Type U replacement pet filters product image

A 12 pack of replacement pet filters costs around $20. These are Type “U” filters.

How to install & replace the filters

Image showing opening the Winix HR900 filter cover first time

Fresh out of the box and getting set up. To get started, you’ll need to open the purifier, remove the new filters from the sealed bags, and put them back into place. It only takes a few minutes, though. Easy to do.

When my purifier arrived and I unboxed I followed the instructions shown in the nice little “quick start guide” sheet it came with. This is basically just removing the front cover, removing the AOC and HEPA filters from the sealed bags, and then putting them back into place.

It’s really simple and no hassle at all so there’s nothing to worry about there.

Winix HR900 filter installation steps diagram

Filter installation or replacement is very easy and only took me a minute or two.

There are just a few steps:

  1. Open the front cover
  2. Install the HEPA filter (follow the directional arrow printed on it)
  3. Install the AOC carbon filter
  4. Insert & snap in the prefilter with the pet filter already attached
  5. Close the front cover and secure it using the magnetic latches

What I really like about Winix air purifiers are the magnetic latches used on the front cover. Very convenient and they make the process even easier.

Winix HR900 filter cover magnetic latch closeup images

The purifier’s front cover uses magnetic latches to make opening & maintenance really is. I’m a big fan of this kind of feature!

Unlike some other products I’ve owned & tested, there aren’t any plastic tabs to break. There’s a small metal plate on the inside of the front cover (which covers the prefilter) that touches and connects to the magnets (one at each side) built into the front cover near the top.

Obviously, considering you’ll own it for several years of use it makes sense that a design lasts and makes owning it easier.

Owner’s manual quality

Winix HR900 owner's manual examples

The owner’s manual is clear and helpful with plenty of clear instructions for the best use & maintenance.

Like the other Winix products I’ve tested, the owner’s manual is clear, helpful, and well done. You won’t have any problem getting started using it right away or performing maintenance.

I do have a minor complaint, though: there’s no more information about the PlasmaWave feature. While the company does state in general terms what it does, it would have been nice to know a bit more about the technology behind it.

Also, unlike some competitors such as Levoit and Honeywell, there’s no customer support contact information on the box flaps where you’ll see them when opening it.

That’s not really an issue, however, as the owner’s manual (and the pet filter instruction sheet, too) has readily available customer support contact information in it.

Winix HR900 pet filter instructions image

Speaking of instructions and information, the pet filter has very good steps and is very clear. The diagrams are a great touch and do a good job of helping to understand how to install one correctly the first time.

The replacement interval and customer service/replacement purchase information is helpful as well.

Noise levels during use (measured)

Image showing measuring noise levels of the Winix HR900 air purifier

I prefer to measure, record, and verify noise levels. I used my sound level meter to get a consistent measurement you can expect during daily use. After doing many air cleaning product tests it’s a great way to have numbers to compare with.

I measured volume levels using a No products found. at 1 meter (3.28 ft) from the purifier. Here’s what I found:

Measurement/Speed Volume (dB)
Off (silent room) 40.3
Sleep 40.3
Low 41
Medium 42
High 44.2
Turbo 55.2

Without a doubt, just like the other Winix models it’s one of the quietest purifiers I’ve used! Sleep mode is ultra quiet – you can’t even tell it’s working.

Even the medium and high speeds are still well below the average noise levels of many other purifiers based on my measurements. Turbo mode, however, is very noticeable just like you’d expect but still has a nice gentle “roar” when in use.

The design touches show in some of the smaller details. For example, when changing speeds it doesn’t have a “harsh” adjustment; it ramps up or down gradually to the next speed you’ve selected.

Night brightness

Image of a Winix HR900 night brightness in dark room

If the purifier is not set to Auto or Sleep mode the brightness is clearly visible in a darkened room. However, don’t forget if you find the air quality indicator annoying you can switch it off by pushing and holding the Timer button.

Just the same, while it does produce a bit of light, it’s not super bright.

Sleep mode brightness

Winix HR900 before and after Sleep mode active in a dark room

Before and after images showing the purifier during the countdown period before switching to Sleep mode when a dark room is detected by the light sensor.

When set to Auto mode, the light sensor will detect if the room is dark and will begin a countdown before it switches to Sleep mode (or if placed in Sleep mode manually). I estimate around 60 seconds lapse before it switches to low fan speed and the control lighting & air quality lights dim.

It’s very dim in that case, but I was still able to see the light from the control panel in a darkened room. If you’re super picky like I am you may consider covering it. Otherwise, most people won’t notice and will have no problems sleeping.

Review summary & score: Is it a good choice?

My honest opinion after trying it? I’m able to confidently say it’s a great choice.

The air cleaning performance is some of the best, and the included pet filters not only add extra pet hair and dander cleaning but also the life of the main filters.  The odor control filter is one of the few offered to use real carbon pellets for up to 12 months of use and has great odor control ability.

While I wish the pet filters were a bit easier to install, that’s a minor complaint. The Winix HR900’s design & build quality, features, and ease of use are excellent. I’m a big fan of the self-adjusting operation and I really love how quiet it is.

Winix HR900 air purifier review editors choice badge image

Is it the cheapest? Absolutely not. But if you’re a pet owner who wants one of the best purifiers available today, look no further.

Head over now and check out the great buyer reviews find out more at Amazon.

  • Quality - 9.4/10
  • Value - 8.2/10
  • Ease of use - 9.2/10
  • Air cleaning ability - 9.6/10
  • Features - 9/10
  • Noise levels - 9.9/10

Not cheap, but a great choice for pet owners who want fresh, clean air. Featured packed and well-made, it's a winner!

The HR900 continues the same tradition of quality and design as their other air purifier products. Unlike some competitors, the HR900 offers a much better odor control filter with 12 months life. Pet dander, hair, and odor removal are great, yet it’s pleasantly super-quiet and does its job without distracting you. Auto mode offers hands-free operation that controls the fan speed based on odor or particle levels.

Sleep mode works well and avoids keeping you up at night. Maintenance is easy and instructions are clear. Unlike the previous WAC-9500 no remote control is offered, however. Pet filters are slightly annoying to install but don’t detract from one of the best-quality purifiers for pet owners sold today. You’ll pay a bit more than competitors, but you’ll get one of the best! A solid choice.


  • 300 sq ft coverage (med.-large rooms)
  • AHAM certified CADR ratings: 194/200/220
  • Pet filter adds 4th filter stage
  • No irritating ozone produced
  • Electronic touch controls
  • Self-adjusting Auto mode
  • Air quality level indicator light
  • Quiet operation
  • Turbo high speed mode
  • PlasmaWave air cleaning feature
  • 1, 4, & 8 hr auto timer
  • Reusable/washable prefilter
  • Great AOC (active carbon) filter
  • AOC filter is rinseable under water
  • Easy filter maintenance
  • 12 month carbon & HEPA filter life
  • Filter reminder light
  • Light sensor for auto Sleep mode when dark
  • Ultra-quiet sleep mode
  • 2 year warranty


  • No remote control included
  • Can’t switch off control chime sounds
  • No additional colors available
  • Limited to 3 timer choices
  • No smart phone control
  • Most costly than some standard competitors
  • Lower room size coverage than 5500-2 model
Grant Williams

About the author

Grant is a professional engineer by trade and has experience with both maintenance and do-it-yourself home projects. He enjoys sharing his expertise & ideas with others to help them improve their comfort and quality of life. Read more »

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