Hands-On GermGuardian AC5250PT Air Purifier Review & Test – What’s It Really Like?

When looking at the GermGuardian AC5250PT you might be thinking, “It’s a lot like the other models. What’s the difference? To help, in my hands-on detailed review of the GermGuardian AC5250PT I’ll tell you all this and more.

I’ll share all the finer details you can only get from hands-on testing and use along with my final review score.

Basics first: Getting to know the AC5250PT air purifier

GermGuardian AC4825 AC4900CA AC5000 AC5250PT product family image

At about 28″ (71 cm) in height, the AC5250PT is a version of the AC5000E and is related to the super-popular AC4825. It’s one of the larger purifiers in the GermGuardian AC series line, which are some of the best-selling air purifiers in the world! Just like its siblings it features a similar design both in style and air purification quality.

The GermGuardian AC series of purifiers includes a large range of models. Based on their good value and simple, reliable designs the ones pictured above are some of the most popular.

As they stand taller by design they’re sometimes called “tower” purifiers.

All members of the AC purifier family include the same basic features:

  • True HEPA filter, pre-filter/activated carbon (charcoal) filter layer
  • UV-C germ killing feature option

AC5250PT, AC5000, and AC4825 air purifier main differences

The AC4825 is a 22″ (~56 cm) tall purifier for medium rooms up to 167 square feet in size. Its twin, the  AC4900CA, is a somewhat lesser-known model that features the same internal parts & operation in a different cosmetic package.

The AC5000E and AC5250PT, however, are for medium to larger rooms up to 180 sq. ft. and are a bit taller at about 28″ (71 cm) in height.

Unlike the other models, however, the AC5250PT features electronic controls. I’ll cover those in more detail later.

Unboxing & first impressions

Image of GermGuardian AC5250PT being unboxed from package

Unboxing my AC5250PT for testing. Inside the box it’s neatly packed and held in place by recycled cardboard. Also included is the owner’s manual and a Guardian Technologies product brochure. Removing it was easy and there was no hassle.

Just like all the other GermGuardian air purifiers I’ve owned and tested, the AC5250PT arrived neatly packaged and well-protected.

Inside I found the usual good things I’ve come to expect:

  • Recycled cardboard packaging used to hold the purifier safely in place
  • The purifier arrived neatly sealed in a protective plastic bag
  • An owner’s manual placed conveniently on top
  • Everything was neat, tidy, and looked good

Additionally, in this case for the first time I also found a nice little product brochure titled “Thank You” which was a nice touch. Inside was not just the contact email for the company but a real phone number for when you have concerns.

One new little touch

Additionally, there a notice encouraging you to register your product for its warranty. The reward is a $10 credit towards your next buy.

GermGuardian Thank You product package insert

Inside the package, I found a nice little “Thank You” fold-out brochure showing some more of the company’s great products. Humidifiers, aromatherapy, and other types of helpful items are shown. Customer support information is there, too, as well as a buying credit offer if you register for your warranty. Nice!

Picking up the AC5250PT is easy – just like its other siblings, there’s a nice little carrying handle area provided on the top rear. I picked my purifier up and got to work testing it out!

Build quality and fit & finish

GermGuardian AC5250PT closeup images of body & assembly quality fit and finish

As I always like to do, after unboxing my new purifier I gave it a close-up look to check build quality and for defects. I’m happy to report the quality is good (just like other products from the same company) and it’s well-made.

There’s no substitute for getting your hands on a product to check the build quality up close. So as I always do as a rule, I went over the AC5250PT to check build quality and for any potential defects.

I’m happy to say it’s well-made and looks great! Body sections are tight without any sloppy gaps (that would be a clue to poor quality). The whole thing appears well put together and feels solid in your hands.

Like the other models in the same family, the body has a satin black finish with a contrasting satin silver trim color on top.

The control panel is well-made too. Everything lines up correctly and looks great.

Checking out the controls

Image of GermGuardian AC5250PT control panel being operated

Shown: Testing the electronic touch controls on the AC5250PT. They’re easy to use and simple to understand. To change settings, simply push that feature to rotate through the various settings and then back to the default (off) setting for each. A clear, well-designed digital display shows the settings at a glance.

In testing the controls I found the AC5250PT easy to use and hassle-free to use, for the most part. The purifier uses electronic touch buttons to control all the major features including:

  • Mode (fan speed – 5 levels to choose from)
  • On/Off select
  • UV-C germ killing option
  • The auto-off timer feature

To switch fan speeds, turn the unit on/off. or setting the auto-off timer, by simply pushing a button as needed. Each touch of a button will cause it to rotate through the different settings and then return to the first setting.

As there are 5 fan speeds you’ll simply rotate through them as you prefer. By default the unit powers on to setting 5 (high). Position 1, low, is a very low noise setting.

Control button beeping

When touched, each button makes a “beep” sound which I found ok and not too loud or annoying. However, if you prefer you can switch off the control beeping.

To do so:

  1. Hold the Timer and UV buttons for 3 seconds
  2. Select the On/Off button

The beeping will reset when the unit is unplugged. Also, you can switch the beeping back on by doing the same process again. That’s a nice detail I appreciate.

Auto-off timer feature

GermGuardian AC5250PT timer settings display example

The timer is a feature I love and that’s super convenient! Just set it for 1 to 8 hours and walk away – the purifier will shut itself off automatically after the selected time.

One thing I’ve really been missing on many GermGuardian purifiers is the lack of an auto-off timer. The great news is the AC5250PT allows you to select 1-8 hour settings before it shuts off automatically.

It’s a great option to let the unit run while you’re out during the day. It’s easy to switch if off again, too: just push the timer button again until the hour setting disappears. It’s then back in manual operation mode.

UV-C germ killing feature use

Likewise, the UV-C feature is extremely easy to use, too. Just push the UV-C button to switch the feature on or off. You’ll know it’s on as the trim ring on the top of the purifier will have a soft blue glow.

What I don’t like

Unfortunately, there is one complaint I have. There’s no memory feature which means once the unit is switched on and then back off again you’ll have to adjust the settings as you did earlier.

It won’t automatically recall the last used settings when turn on again. While not a deal-breaker, it’s an annoying thing and I consider it a poor design decision since there’s no reason it couldn’t be added.

Additionally, some competing products like those from Levoit do offer this convenient detail. I’ll leave it up to you to decide how important that is. (Note: for the money, I can live with this as I’m still really fond of the purifier!)

Specifications & CADR ratings

GermGuardian AC5250PT Specifications
  • Room size rating: 180 sq. ft (medium room)
  • UV-C germ killing light
  • Titanium Oxide odor molecule remover
  • 5-speed fan control
  • Auto-off timer with 1-8 hour settings
  • True HEPA filter w/ activated carbon filter and Pet Pure anti-microbial coating
  • Clean Air Delivery Rate (CADR) ratings: Dust (126), pollen (128), smoke (116)
  • Low-noise fan setting (speed #1)
  • Replaceable UV bulb
  • Dual-section blower fans
  • Electronic push button controls
  • Filter replacement reminder
  • UV bulb replacement indicator
  • 5-year limited warranty
  • Replacement filter: FILTER C (FLT5250PT) OR FLT5000 standard HEPA
  • Power use: 56.5W (max. fan speed)
  • Carrying handle
  • Weight: 10 lb 1 oz (4.56 kgs)
  • Cord length: 6 ft.
  • Control location: top
  • Size: 6.1 x 9.5 x 27.25″ (15.5 x 24.1 x 69.2 cm)

If you’re not already familiar with it, it’s helpful to understand more about the Clean Air Delivery Rate (CADR) standard used by the industry. This is a voluntary lab-tested rating of an air purifier’s cleaning ability.

GermGuardian AC5250PT CADR ratings label and specifications

The AC5250PT’s CADR ratings are shown here.

The AHAM is an organization that verifies the testing results of home appliances & carry out lab testing for appliance manufacturers. This is voluntary as it’s not required by law.

In simple terms, it’s a rating used to help you know before buying an air purifier’s effectiveness. The rating numbers mean “higher is better” as they’re lab tested using a series of tests to find out their air cleaning effectiveness.

In the case of this model the specs are good and you’re assured you’re getting proven performance.

Size and thoughts on using a “tower” purifier

Image of GermGuaridan AC5250PT height measured in inches

At nearly 28″ in height, it’s definitely not small! The name “tower” refers to the tall, slender design of many air purifiers sold today.

One reason for this design is due to having more fans to give more airflow. The fans are placed in a vertical way to help reduce the amount of space the purifier needs on your floor.

It’s important to make sure you have enough room before buying. I recommend leaving about 2 feet or more in front and behind the purifier as it needs space to circulate the air without interference.

Obviously, as it’s tall it can be tipped over, but in my experience, it’s not too easy to tip over. As it weighs just over 10 lbs it’s pretty steady on a flat floor.

Carrying the purifier

Example image of carrying the GermGuadian AC5250PT using carrying handle

One thing I really like is being able to carry it easily from place to place at home using the built-in carrying handle area. At the rear of the top, there’s a recessed area where your fingers have plenty of room to pick it up securely.

It’s a nice touch I didn’t notice at first but after moving it around to find the ideal place in my home, I found it handy.

AC5250PT power use measurements

GermGuardian AC5250PT power measurements Watts image

Pictured: I measured power use (in Watts) for all 6 recordings (5 speeds, plus the off setting).  I recorded power meter readings both with and without the UV-C feature switched on. My measurements are similar from speed 4 and down to the smaller AC4825’s power use, which is good!

How many watts does the AC5250PT use?

Unfortunately the manufacturer doesn’t give power consumption specs. However, I’m already very familiar with other models like the AC4825 which uses about 50 watts on the top speed setting.

Rather than guess, I measured power use in Watts for all speed settings with and without the UV-C feature switched on. Note that the UV-C option uses about 8W of power.

Mode/Speed Power Use, UV-C Off Power Use, UV-C On
Off ~1W ~1W
5 (High) 49.6W 56.5W
4 47.1W 53.9W
3 37.1W 43.8W
2 33.5W 40.4W
1 (Low)  29.1W 36.1W

Ultimately, I found it doesn’t consume much more than a medium room purifier. In fact, it’s only when it’s on the level 5 setting (maximum speed, the default setting) that it draws about 3W more – still a relatively low amount altogether.

At setting 4 and below it’s almost exactly the same power use as the medium room AC4825 or AC4900CA models I’ve tested (around 50W).

Air cleaning ability & performance

Dirty air purifier filter that has collected dust

I have an unfortunate major dust problem at home! I’ve had great success getting relief with the GermGuardian purifiers as you can see above from my dirty filter. The AC5250PT was no different – and in fact even better than smaller models.

General filtering performance

Just like my other purifiers from the same company, the AC5250PT did a great job of filtering the air during testing and everyday use.

As I have a major dust problem it’s easy to know how well a product is working. The purifier did a great job and I don’t have any complaints aside from a lack of a “Turbo” super high-speed mode offered by some Honeywell models.

It works well and I especially enjoyed coming home to fresh air after a day at work. Additionally, when didn’t want to use it I just set the timer for about 8 hours and left it alone.

It’s also great for removing allergens, hair, and general items like pet dander and odors.

Odor removal performance

I tested the unit with several odor sources and it worked well! I noticed it only took a short time before odors trapped indoors were gone or really much less noticeable than before.

The activated carbon filter (charcoal, it’s also called) works well for most odors, volatile organic compounds (VOCs, which are airborne chemical substances),

GermGuardian AC5250PT square feet coverage and room size

The AC5000 & AC5250PT are good for large rooms up to about 180 square feet in size. That being said, there’s absolutely no reason it can’t be used in a small room!

In fact, you’ll find that it cleans the air even faster in that case.

180 square feet is a room about 12 x 15 ft in size. Bear in mind that this is an approximate size used – it doesn’t have to be used in a room exactly that size.

When used in larger rooms the amount of time required to fully cycle and clean the air increases, of course. In my experience the term “large room” is accurate and the AC5250PT works well for those.

Tip: If you have a large main room or larger rooms you can also use more than 1 AC5250PT to get extra coverage.

Using multiple purifiers for more room coverage is a great way to save a bit of money or for convenience as you can place them at different locations.

Filter ability

GermGuardian AC4900CA filter close up

The AC5250PT’s HEPA filter section (shown here) is made up of a folded, dense fiber material. A second section, the pre-filter/activated carbon filter, is responsible for trapping larger particles as well as odors and volatile organic compounds (VOCs) in the air. It’s capable of excellent filtering ability and works well. The filter can capture nearly 100% of all particulates in its airflow down to 0.3 microns in size!

The high efficiency particulate air (HEPA) filter is fantastic for removing the most common air quality issues (especially those that cause allergies!).

Here’s the basic list of air contaminants the AC5250PT can remove:

  • Pet dander
  • Pet hair (thanks to the pre-filter)
  • Dust mite allergens
  • Pollen
  • Dust
  • Home construction particles
  • Smoke residue
  • Smoke odors
  • Chemical and organic odors
  • Chemical vapors
  • Sickness-causing microbes from pets & humans

Essentially, this is an air cleaning system as the filter assembly is made of 2 main parts: the pre-filter/activated carbon filter and an extra 2nd section, the HEPA filter.

The pre-filter section is a less dense & thin section covering the active carbon filter. It’s job it so first capture larger items in the air like pet hair, dust, and so on.

The active carbon filter traps odors and other chemical substances in the air.

Finally, the HEPA filter captures an amazing 99.97% of particles passing through it down to 0.3 microns in size. (That’s less that 1/1,000,000 of a meter, microscopic in size)

The UV-C germ killing feature

GermGuardian UV-C and Ti02 germ killing badgesThe AC5250PT, like several other GermGuardian air purifier models, features a bulb and titanium-oxide germ killing feature which radiates onto germs passing through it. This renders them inactive by affecting their molecular and protein structures.

AC5250PT UV-C bulb glowing trim ring example

When activated, you’ll see the small, thin trim on the base of the silver decorative top glows from the UV bulb inside. Don’t worry – you’re not in any danger from exposure to ultraviolet light. It’s safely contained inside.

It’s kind of cool how the feature adds a styling touch to the unit and gives it a lovely blue light accent.

One complaint I have, however, is that once it’s in use, switching the purifier off and then on again won’t re-activate the feature. You’ll have to do so manually, as there’s no memory feature (unlike some competitors) to restore the setting upon the next power up.

Like lack of a fan speed setting memory, it’s not a real problem, but an annoyance to know about.

Does the AC5250PT produce ozone?

As I explained in this post, filter-based purifiers don’t add anything unhealthy to the air. They don’t produce emissions, gases, or by-products.

The AC5250PT is perfectly safe and healthy as it does not produce unsafe ozone levels.

In fact it produces 1/20th of the level considered acceptable by the Health Canada Guideline 2010 based on exposure levels & time considered acceptable.

Filter & UV bulb replacement indicators, parts, and cost

GermGuardian AC5250PT filter reminder reset diagram

The purifier features a helpful way of indicating when it’s time to check and possibly replace the filters. After about 6 months of use, the filter replacement light will flash continuously and you’ll hear a beeping sound for 30 seconds.

If your filter has had very light use and isn’t heavily used, you can reset the indicator by holding use a fine tip like on a pin in the reset button switch hole on top of the control panel.

In the case of replacement for the UV-C feature bulb, the UV indicator on the display will blink.

Blinking Light Type Meaning
UV indicator flashing UV bulb needs replacement
Filter light flashing + beeping Filter needs check/replacement

Filter life and costs

GermGuardian FLT5000 vs FLT5250 filter comparison imageThe AC5250PT ships with the FLT5250 filter installed. It’s a pet version of the standard FLT5000 HEPA/carbon filter. It features a special anti-microbial coating. However, FLT5000 filters can be used as well with no problem.

Filter life is around 6-8 months depending upon use and the level of particulates in the air where it’s used.

As an example, consider that cigarette produces a significant amount of particles as well as odors that will become trapped in both filter sections. You can definitely expect a limited filter life in that case.

For lighter you’ll extend the filter’s life. Replacement periods will be fewer and further in between.

If you’ve got a lot of pets at home and they produce a lot of odors, dander, and other unpleasant things the filter’s life will decrease.

Filter replacement cost

Replacement filters cost around $30 or so for the genuine GermGuardian set. However, 3rd party replacements are available for a few dollars less if you don’t mind not using the pet version.

If you’re trying to keep costs down those are great options. The great news is that you can replace the prefilters separately!

There’s no need to pay for the extra HEPA filter if yours isn’t fully used up yet. Prefilters are typically available in packs of 2 or 4 and sell for about $15-$25.

How to replace the filter

Diagram showing how to replace filter on GermGuardian AC5250PT

Replacing the filter assembly is easy – just remove the back cover (1, 2) and then pull the filter out and down (3,4). It only takes few minutes to do.

UV-C bulb replacement & pricing

GermGuardian AC5000 UV-C bulb LB5000

The AC5250PT uses the standard bulb used in the AC5000, which is the LB5000. Replacement will cost near $25, but expected life is rated at about 12 months.

GermGuardian AC5250PT UV bulb replacement diagram

Filter replacement is done by removing the protective UV bulb’s metal cover. The cover shields you and others from ultraviolet let as well as protecting it. After removing the filter, you’ll need to remove 4 screws holding it in place. You can then pull out the bulb.

Replacing the UV bulb, should it be needed, takes about 15-20 minutes or so depending on how comfortable you are with a screwdriver. After removing the filter you’ll see the metal bulb shield which has 4 screws: 2 on top and 2 on the bottom. Removing these with a Phillips head screwdriver will give access to the bulb.

Once that’s done, it’s just a matter of twisting it and pulling it out. It’s pretty easy to do if you’re comfortable with small tasks like that.

Ideally, however, there should be a long between replacements as the bulbs are rated at about 12 months of life. (The owner’s manual explains the simple process well and it’s clear & helpful)

Owner’s manual quality

GermGuardian AC5250PT owner's manual example closeup

Just as I’ve come to expect the owner’s manual was again clear, detailed, and easy to read. All basic & important information is included. There’s also information about how to contact the company as well as replacement part numbers.

I always check owner’s manuals when reviewing products because I know how frustrating it can be when information is lacking or confusing.

After unpacking my purifier I flipped through the manual. It’s clear, well-written, and gets right to the point. It’s also printed in English, French, and Spanish.

Although short (about 10-12 pages for English, I think) it’s concise and good. Inside you’ll find:

  • How to use your purifier
  • The indicator lights (power, air filter replacement reminder, and UV light bulb replacement)
  • Replacement filter model specs
  • How to contact support
  • Power consumption
  • Specifications: size, weight, and square feet coverage

Honestly, the purifier is so darn easy to use it’s really not necessary, although if you’re a first-time buyer I’d recommend brushing up on product use tips.

However, one thing did annoy me: the Clean Air Delivery Rate (CADR) ratings aren’t inside as well as a few other specs missing. They’re available at the manufacturer’s website, however.

I’m not sure why they’re not included in the manual.

Noise levels during use (measured)

dB noise level meter measurement image

I prefer to personally measure, record, and verify the noise levels of the products I test. I used my sound level meter get a consistent measurement you’ll find in typical real-world use. The best thing to do is to get real measurements to back up my observations with data.

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 (room noise) 39.3
5 (High) 57.2
4 50.4
3 49.2
2 45.5
1 (Lowest) 41.8

Overall I have to say it’s a quiet purifier, aside from speeds 5 & 4, which are moderately noise but not too loud. On settings 2 and especially 1, I could barely even hear it at all.

Set to one of the lower settings it’s nearly impossible to hear while the TV, radio, or other sounds are playing. Overall I’d say it’s a pretty quiet purifier and good for those who appreciate low-noise appliances.

Night brightness

GermGuardian AC5250PT lights in dark room brightness example

At night the purifier has a bit of a glow (especially with the UV-C featured turn on as shown above). However, in my experience it’s not too bright. It won’t light up the entire room. If you’re sensitive to light when sleeping you’ll likely want to turn the UV-C feature off.

Unfortunately unlike some competitors there’s no way to turn off the display’s backlight or the power light either.

However, in practice, I didn’t find them to be a bother at night. Then again, as the human eye is especially sensitive to blue light, I did switch off the UV-C feature at bedtime.

The power LED has a soft green glow that’s visible in the dark but not very bright. The UV-C trim ring adds an effect like a night light.

As the human eye is more sensitive to blue colors, you may want to leave it switched off when sleeping if you’re sensitive to light. I know I am, so I used it without the feature on at night.

Optionally you can always face it in a different direction to avoid the light as well.

The GermGuardian AC5250PT vs AC4825 & vs AC5000

GermGuardian AC4825 vs AC5000E vs AC5250PT image

As they look so similar it’s easy to see how it can be confusing between these 3 models. There are a few differences to know, with the PT version being a slightly enhanced version of the AC5000 model.

There are a few differences to know when shopping. Namely, it’s a matter of room size coverage.

While the AC4825 is a small to medium room purifier and features a recommended coverage of 167 square feet, the AC5000 is basically a larger version of it. The AC5000 and AC5250PT are rated up to 180 square feet but have more fan power than their smaller sibling.

AC4285 and AC5000 models feature the following:

  • HEPA filter, prefilter, and activated carbon filter layer
  • 3 fan speeds with manual rotary control
  • UV-C / TiOxide germ killing feature
  • 3 year limited warranty (AC4825) or 5 year limited warranty (AC5000)
  • UV-C bulb and filter replacement reminders

Essentially, the AC5250PT adds more features thanks to electronic controls:

  • Electronic touch button controls
  • Auto-off timer w/ 1-8hr selections
  • 5 fan speeds
  • Pet (anti-microbial) coating filter type

It too features a 5 year limited warranty, so you’re no losing anything there. The great thing I found, though, is that it’s only a bit more money than its twin the AC5000.

For the $20-$25 extra dollars or so I think it’s well worth the money!

Review summary & final score

As a happy AC5250PT I can honestly say I like it! It’s a great purifier that allows me to finally enjoy the main thing I was missing from the other models I own & have tested: electronic features.

While it is sold as a “pet” purifier, in truth it’s a good all-around value-priced air purifier for any reason you need one. Don’t let the pet description fool you.

This one’s the same – and better – than its siblings that have already proven themselves as great air cleaning products you’ll enjoy.

Despite a few minor complaints, it’s a winner and still a good value! Be sure to head over and see why thousands of others made it one of the best selling purifiers at Amazon.

  • Quality - 9.2/10
  • Value - 9.1/10
  • Ease of use - 9.9/10
  • Air cleaning ability - 9.3/10
  • Features - 8.2/10
  • Noise levels - 8.8/10

Despite a few annoyances, it's a solid, value-priced purifier that lives up to its popularity. A great all-purpose air purifier despite the "pet" name.

As an owner & tester of multiple GermGuardian products, I can happily say it lives up to my expectations. Just like other models, it’s a value-priced purifier that’s simple to use, reliable, and features very good filtering ability. The AC5250PT takes the simple design of its twin AC5000 and adds electronic controls along with a convenient auto-off timer.

Although rated for pets, it’s really the same design with an enhanced filter type (anti-microbial). Unfortunately, no memory feature is designed in so it won’t remember your last settings when turned on. It’s quiet, well-made, and hassle-free to use. Maintenance costs are reasonable and lower-cost filters can be found. A good choice, and worth the few extra dollars vs its lesser sibling. Highly recommended!


  • Good value for the money – worth the additional few dollars
  • Electronic touch button controls
  • Clear, easy-to-read digital display
  • 5 fan speeds (vs 3 of most models)
  • Lab-proven CADR ratings & performance
  • 180 sq. ft. coverage
  • Auto-off timer with up to 8 hr delay
  • Control beeps can be switched off
  • AHAM Verified & Energy Star Certified
  • Very easy to operate
  • UV-C feature kills germs
  • Carry handle built-in
  • Filter replacement reminder
  • UV bulb replacement reminder
  • 5-year limited warranty
  • True HEPA/prefilter/carbon + UV 3-in-1 air cleaning
  • Maintenance is easy to perform
  • Low operational noise
  • Pet C version adds anti-microbial filter for germ reduction
  • Prefilter/carbon filter separately replaceable
  • Can use standard FLT5000 filters
  • Won’t tip over easily


  • No memory feature despite electronic controls
  • Can’t switch off display lighting
  • Blue glowing trim could be noticeable at night
  • Tall height may not be suitable for all users
  • Original filters can be more costly
  • No additional colors available
  • No WiFi or Bluetooth control interface
  • Timer is limited to 1hr increments (no 1/2 hour)
  • No air sensing or auto-regulating features
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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