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GermGuardian® FLT4825 Filter-B HEPA GENUINE Replacement Filter B for Series Air Purifiers GermGuardian® FLT4825 Filter-B HEPA GENUINE Replacement Filter B for Series Air Purifiers
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GermGuardian® FLT4825 Filter-B HEPA GENUINE Replacement Filter B for Series Air Purifiers

Availability: In stock - USA and Canada SKU: FLT4825
MSRP: $44.99
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Product Information

New Filter Look! Optimal Performance!

Our filters have had a makeover! Although the look and color have changed, they still provide the high level filtration that helps you Create a Better Home Environment®. The new design optimizes the HEPA performance level filtration filtering 99.97% of allergens down to .3 microns. This is a direct replacement for your current filter. We have updated the design to provide a more rigid filter and changed the frame color to make it easier for you to identify our Genuine HEPA (yellow frame) and HEPA Pet Pure™ Filters (purple). We know how frustrating it can be to find the GENUINE filter in the sea of options you can find online. REMEMBER: It is very important to use only GENUINE filters made by Guardian Technologies to ensure proper performance and fit in your machine. Please don’t hesitate to reach out to our friendly US Based Support team if you have any questions regarding your filter at 1-866-603-5900 or support@guardiantechnologies.com. Thank you for your purchase of Guardian Technologies products.

Important: The fit of your new filter may vary from the original.  It’s due to the change in materials and is designed to be a less snug fit.  This will NOT affect the performance of the filter.

GermGuardian® FLT4825 HEPA Genuine Replacement Filter B is a combination filter. It includes a HEPA filter that captures 99.97% of allergens as small as .3 microns. It also contains a pre-filter/activated carbon filter layer that captures odors from cooking, pets and smoking.  It is recommended to use with the GermGuardian® AC4300BPTCA, AC4900CA, AC4825, AC4825DLX AC4850PT, CDAP4500BCA, CDAP4500WCA; PureGuardian® AP2200CA and Black+Decker™ Model BXAP148. The use of this genuine Guardian Technologies™ replacement part will maintain the product's performance.


  • NEW LOOK:  HEPA filter continues to reduce allergens while the new  yellow frame helps you identify that it's a GENUINE HEPA Guardian technologies replacement filter. 
  • CAPTURES ALLERGENS:  HEPA Filter captures 99.97% of dust and allergens as small as .3 microns such as household dust, pet dander, mold spores and plant pollens.
  • REDUCES ODORS:  Charcoal filter layer reduces common odors from pets, smoking and cooking.  Acts as a pre-filter to capture large dust particles, helping to extend filter life.  

Replacement filter for GermGuardian Air Purifier Models AC4300BPTCA, AC4900CA, AC4825, AC4825DLX. AC4850PT, CDAP4500BCA, CDAP4500WCA PureGuardian Model AP2200CA and Black+Decker BXAP148

Only one single combination filter needs to be replaced every 6-8 months depending on the use of the product; Charcoal replacements can be purchased separately to extend the life of your filter (Model #FLT22CB4).  IMPORTANT: Use genuine Guardian Technologies replacement parts to maintain product performance.

Product Specifications

  • SKU: FLT4825
  • Weight: 0.35lbs.
  • Dimensions: 1.29 x 4.76 x 15.77


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By: Slats

Great replacement

Sturdy product great fit

By: EvC

Good filter

Great filter, but a little pricey. I do not change them every 6 months but annually.

By: Mim

Flt 4825 filter -b true HEPA genuine replacement filter

I would buy this again.

By: Susan

It certainly helps!

I use this in my husbands office. Although it does not take all the smoke out (he is a smoker) it does help. This is the only room he smokes in and I could not enter the room before having this to help. Thank you so much. Although the ideal situation would be if he would quit smoking...but it is not, so I am pleased with having these help keep it down.

By: Leah Reynolds

Simple to Use and Reliable

I deeply appreciate this product and the thoughtful, easy way you made it possible to replace the filters. We use two of these in our home and they are important for our quality of life. Thank you!

By: Christie

Good product

Loved the ease of ordering online and got the product fairly quickly. The filters were just what my fan needed for so long.

By: birchbaylady

FLT4825 Filter-B True HEPA GENUINE Replacement Filter

It arrived very quickly and fit perfectly.

By: Rafe

Good air after hurrican irma

We've been hit by the hurricane in Florida. We bought two air guardian air purifiers for our small house last year and our air was immediately cleaner. After Irma, when we finally got our electricity back--they were a life saver. My wife and I have lung problems and with the air purifiers with the UV built in we were able to get good air--free of bacteria and mold. Thank you Guardian Technologies for creating such fine air purifiers. God bless you all.

By: Skinner

I would buy this product again.

It was time to replace the filter in my air cleaner and I ordered it on line without shipping costs. The delivery was made quickly and I have installed the filter and all is well again with my purifier. The on line shopping for this filter was easy and quick.

By: Sunhine


I have no words for this!!!!!!!!! It arrives super quickly :) :) Thank you... The replacement Filter is amazing, the air is super clean and I love it.. Don't think twice just order it you will be happy you did :) :) :)

By: Joe

I think mine is great.

Have had it two or three months.

By: Moe

Breathe easier

All I can say is when I turn on the filtration I breathe easier and the air smell clean

By: The Bostonian

This air purifier is amazing!

I never dreamed this purifier would be as sensitive as it is. Even I so much as make my bed, the purifier picks up the dust in the air from that activity. I also love that I can control it from my phone. It's dependable and amazing.

By: Mimi

Best air purifier!!!

Best air purifier ever!!! My filter last for 1 year!!!

By: Kiki

Great product

Amazed at how much dirt the filter collects. Bought in bulk (8) to save some money. Very fast delivery.

By: novaguy

great product

I use the air filter in the bedroom because of significant allergy issues. The filter operates quietly and does a great job. I've used the GermGuardian for about 4 years replacing the filters about once a year and vacuuming the larger particles off the foam filter about every 60 days. If I were to purchase another unit, I would get the exact same thing.

By: Robert

Works fine.

The filter works fine and it looks as though it was upgraded from the original filter that came with the device. However, I do think that it is a bit pricey.

By: Stacey Del Bucchia

Air filter

Love this air purifier y replacement filter so awesome...super easy y dependable...lasts a long time!! It feels great to breathe clean air❤

By: Mary Brown

Easy to install, but highly priced

Super easy to replace the new filter. Seems to be working great. However, itt will be hard to recommend a product that costs so much to continue using. Try to bring the price of your replacement filters down please!

By: David l>

Perfect air

I have a large 5-level split house and three of the Guardian units in my house. Recently I had an independent company do an air assessment in my home. The system passed with flying colours -- the air in my house was nearly perfect in spite of the fact that I have broadloom through out, sheers / heavy overdrapes on all the windows and a six-year old dog. My housekeeper keeps insisting "there is no dust in this house!" I have not used my asthma medications since I bought the filter units. Thanks very much!

By: Andrew

Good product, fast delivery.

I noticed a big difference in my allergies after a couple hours of use.

Delivery was very fast.

By: Mr. Steve

Fit like a glove!

Super easy swap out of old filter with the new one that fit perfectly. Since the manual covers two different models each with a different size filter I had to search for the model # on the unit to make sure I got the right one. No complaint. New filter arrived in perfect condition.

By: Brian

Happy with my Air Purifier Filter

Original filter lasted 9 months - I have noticed that my problems with dust (sneezing and running nose) have been greatly reduced.

By: Lisarose

Quick delivery

Product shipped fast and I had my new filter in a couple days. Lasts a long long time so I don't have to worry about having to change it out.

By: Kay

Good product; fast shipping

The replacement cartridges shipped very quickly, which was good, because we didn't have any backups on hand. I appreciated that the original box had all of the reordering information printed on it. That was very helpful!

By: viviana

great product

so far happy with the results.

By: TR

Rid me of dog odors!

I moved into a new house where dogs previously lived and figured that getting the carpet cleaned (2 times) would rid me of their odor. This did not happen. Because dog scent gives me allergies I needed to figure out another way to get rid of the smell. So I bought this. I put it on and woke the next morning without any nasal allergies at all! The one bad thing was that it left a new plastic smell in my room, but it went away after a week and was well worth the trade of smells. Sometimes I will put it in another room for a while, but when I start to get allergies for whatever cause I put it back I my bedroom and I go back to having open airways! I am now buying another one to see if it works on my mom's cat odors!


Can really tell a difference

I ordered three by mistake, but gave one to a friend. I can really tell a difference--when I'm stopped up, I just stay in there with door closed and I get un-stopped up. I am taking meds which help my sinuses and nose, so it is a wonderful thing for me. He absolutely loves his, and his wife is really happy too. Would highly recommend.

By: Kayla


This filter lasts for a long time, so it is a great buy to replaced an old one that is used up.

By: Liz Whelan

Good choice

THis really has helped clear the air of cat odor and now you have a hard time telling we even have pets.

By: Kent Chui

well made

little pricey. but well made like the original. i am happy with it. hope it can drop the price little bit. will recommended. Thanks

By: amanda faye olds

Does the job!

Easy to replace, although makes me wonder if price is really worth it. Could just clean off old filter with air compressor tool.

By: Mariacharmediots

Cool item good price

I like this germ guardian it helps cleaning up smoke and bad smells. I thought this was a really great price and for such a big guardian!!


Pure air

I've had this air filter system for over two years and it has made a difference. It's quiet and effective.

By: Sheila Sharkey

germguardian filter

I have some breathing problems and I find that using this product helps my breathing greatly, I also have cats in the home and I feel this keeps thee air cleaner.

By: Marilyn S Rubbo

great buy

we have a cat so even with the brushing and frequent cleaning the air quality was heavy. Also I love to cook so the smells lingered with the home. We notice within the hour a big difference in the fresher air quality.

By: Nelda Sexton

germguardian FLT4825 works great.

I haven't used this replacement filter yet, since I've just had the unit for a week. But I do love the air purifier. My husband has allergies and it has helped clean the air in the bedroom of the cat dander and hair that was floating around. He loves it too.

By: AMD "tropicslady"

Works great...

Helps a lot with allergies. Fairly quiet, but it does make some sound. I just consider it "white noise" that helps drown out the barking dogs...my fan is louder.

By: Donna Bugarski

Love It!

We chose this for one room in particular that smelled like our animals. Then we ordered another, for the fresh feel to the room after it had been running. Wish we could afford one for every room in the house. In the meantime, we move them from room to room.

By: Ernest

Awesome filter

I bought a Germ guardian, i have using it one week and it help me a lot with my allergies, the filter has double protection, first has a sponge to catch big things, then has the classic kind of withe cloth to filter the dust and thin material.

By: Criminoogist99

Filter Goes With A GREAT Air Purifier

I bought this replacement filter earlier than I need it just to be sure I'm ready. The Germguardian 3-1in-1 Air Purifier is FANTASTIC. It's recommended especially for asthmatics (which I am) but would benefit anyone. It's tall (about the height of a computer tower) but compact and very sleek in the design. It has a UV light that kills pathogenic germs and the filter is a three in one and of course HEPA. I run mine non-stop in my room and it WORKS. The filter takes care of any allergens that are in the air (I live on a farm so there are plenty) and leaves my room "safe" for my asthma. When I have bad asthma attacks and I'm stuck in my room with my 'clean' air, I feel at least a little relief from knowing that this filter is working for me, and it does truly make it much easier to breathe in here. I HIGHLY recommend the air purifier that this filter goes with, ESPECIALLY for asthmatics. It's only $35 and trust me, you will never regret spending that on the GermGuardian.

By: Chad

Great price, great product, great results

Although I'm on the fence on the actual Germguardian unit I have, the filters and UV light kill and eliminate all orders. This replacement filter was reasonably priced, arrived almost overnight and does a great job. My previous hadn't been changed out in almost 2 1/2 years, so with gentle clean, you can maintain for more then 1 year.

By: ecolby44

Very effective fliter

This was my first filter replacement I purchased for my GermGuardian Air purifier. I love the air filter and after a couple months of usage and vacuuming the first part of the outer filter on my original filter I decided to buy a replacement since the inside was black. I received this air filter and was shocked to see that it was exactly like the first. I have bought replacement filters for other make/models of air purifiers and the replacement filters were always different than the original somehow. This was exactly like the original, including the removable black piece on the front that catches the larger pieces of dust and pet dander I have. It popped into my GermGuardian in 2 seconds and has been working excellent since.