Actual Size: 21.5x23.25x1"
Model: AFB21.5x23.25x1M8A
Actual Size: 21.5x23.25x1"
Model: AFB21.5x23.25x1M11A
Actual Size: 21.5x23.25x1"
Model: AFB21.5x23.25x1M13A
Available In MERV Rating:
8
,
11
,
13
Made in the USA Ships in 24 hours
Add To Cart
Made inthe USA
Ships in24 Hours
Why FilterBuy Air Filters?
Long-Lasting
FilterBuy filters are designed to last up to 90 days, 3 times longer than fiberglass filters. If you have pets, kids, or allergy sufferers in your home or business, replace your filters more often to maintain superior indoor air quality and keep your energy costs low.
Made In The USA
All air filters are manufactured by FilterBuy in the USA using 100% American made components. By purchasing directly from the manufacturer, you’re saving big on a premium product.
High Quality
21.5x23.25x1 pleated air filters are at least 20 times more efficient than fiberglass filters. Filter frames are made of beverage board, which stays strong through humidity and temperatures up to 200° F. Synthetic media provides significantly higher particulate efficiency than standard cotton media.
They are exactly the right size. They are well made of quality materials.
Verified Buyer
Exactly as described, obvious better
Exactly as described, obvious better quality than Home Depot units they replaced.
Verified Buyer
Received package in perfect condition.
Received package in perfect condition. Replaced old filter with the new one and it fit as it should. Also, quick delivery
Verified Buyer
Easy to order. Price is
Easy to order. Price is great and shipping was fast.
Verified Buyer
Works just fine!
Works just fine!
Verified Buyer
Great experience, web site is
Great experience, web site is user friendly and was easy to find what I was looking for. Shipment and delivery perfectly on time. Price is fair, HVAC filters I purchased are high quality. Definitely will keep this site as a reference. Thanks.
Verified Buyer
Great products
Great products
Verified Buyer
Your company replaced a product
Your company replaced a product That was shipped by mistake quickly I called your office told your people of the error. No questions asked. I was told to give the wrong item to a charity which i did. The correct filter has been received. Thank you. I have purchased your filter before and will recommend your business to my friends stay safe
Verified Buyer
We were using a custom
We were using a custom built filter, but these are working just fine.
Verified Buyer
Perfect
Perfect
Verified Buyer
I love this filter. It
I love this filter. It fits so much better than past filters I was buying!
Verified Buyer
Excellent selection, competitive pricing, and
Excellent selection, competitive pricing, and very quick delivery.
Verified Buyer
Very pleased with these filters
Very pleased with these filters
Verified Buyer
filter fits fine.
filter fits fine.
Verified Buyer
Very happy
Very happy
Verified Buyer
Great web site. Really easy
Great web site. Really easy to order. Super service
Verified Buyer
Would have liked to have
Would have liked to have an estimated delivery date at time of purchase
Verified Buyer
This is an outstanding company,
This is an outstanding company, the filters I received fit perfectly. I have a older model inline furnace with a filter slot, filters I have used in the past always bowed. These filters are well made and do not bow. Thank you for timely delivery and a great product....
Verified Buyer
Great filters in a size
Great filters in a size I could not find anywhere else
Verified Buyer
Thanks for the filters
Thanks for the filters
Verified Buyer
Nice filters. Had a problem
Nice filters. Had a problem being I ordered one wrong size. I called today, they’re going to ship me free even though it was my mistake.
Verified Buyer
Fit well. I will reorder
Fit well. I will reorder when needed.
Verified Buyer
Very well pleased, but have
Very well pleased, but have already completed a product review and response. Please see previous correspondence. CWFORBES
Verified Buyer
Order received in a timely
Order received in a timely manner. My a/c unit requires a special size filter. Your company was the only place I found this particular size. Also, your price was awesome. My regular supplier charged almost as much for 1 filter as I paid for my entire order for yours. And, another great thing is that your filters last much, much longer than the others that I used. Thank you for your great product.
Verified Buyer
Filters were exactly what I
Filters were exactly what I ordered. I am very happy with the product.
Verified Buyer
Getting better all the time.
Getting better all the time. Been using for several yrs now. Love the ease of reordering and delivery.
Verified Buyer
Great, fast service. Good product.
Great, fast service. Good product. Never been disappointed.
Verified Buyer
Good product
Good product
Verified Buyer
Fair Price. Next day delivery.
Fair Price.
Next day delivery.
Verified Buyer
I received the filters promptly
I received the filters promptly . I haven’t installed them , so I don’t know yet if they will fit and work correctly
Verified Buyer
Easy online order and great
Easy online order and great product. Timely delivery. Very please with FilterBuy.
Verified Buyer
Ordering online was easy and
Ordering online was easy and convenient. The price of the filters was not bad; reasonable. Thanks for offering this option.
Verified Buyer
very happy with product, price,
very happy with product, price, and delivery..will purchase again
Verified Buyer
Pleased as punch
Pleased as punch
Verified Buyer
Extremely east to order. Package
Extremely east to order. Package arrived in less than a week. Excellent service.
Verified Buyer
Good price, good service
Good price, good service
Verified Buyer
Great customer service A+
Great customer service A+
Verified Buyer
Good.
Good.
Verified Buyer
Just what we requested.
Just what we requested.
Verified Buyer
Good fit. I have no
Good fit. I have no idea how to measure there quality.
Size was right on. Still a little pricey
Verified Buyer
I was extremely pleased with
I was extremely pleased with the easy manner it took to place my order. I just replaced my first filter today (May 16, 2020) and it fit perfectly. I'm thus far pleased with the product and the process it took to order them. Glad I found you guys. Just a side note - I tried to buy this specific size at Lowe's and Home Depot. I could not find the right size. I'm happy I did discover your product.
Verified Buyer
Perfect fit
Always a perfect fit for my A/C system.
Verified Buyer
Appreciate
This is our second order of these filters. It’s an odd size to find. We really like being able to find them here.
Verified Buyer
Like them
Like them
Verified Buyer
Everything was great and very
Everything was great and very smooth with my purchase. Solid company
Verified Buyer
Haven't opened box yet.
Haven't opened box yet.
Verified Buyer
Came to the house in
Came to the house in 3 days
Fit well easy as pie
Verified Buyer
Good
Good
Verified Buyer
A good filter with great
A good filter with great delivery service. Thanks
Verified Buyer
Perfect fit
Perfect fit, prompt delivery service. Love it!! I could never find the right size filter from hardware stores. And the price is reasonable.
Verified Buyer
Very good filters
Very good filters
Verified Buyer
Great filters
Perfect fit and are working great.
Verified Buyer
Service department is outstanding
Service department is outstanding
Verified Buyer
Great customer service
They sent me new filters free of charge when the initial ones didn't fit.
Verified Buyer
Prompt delivery
From order to delivery was prompt and as stated in their information on order. Will buy from them again. 👍🏻
Verified Buyer
Great Product!
I have an unusual size filter so it took me a while to find a good place to purchase them. The product is outstanding and fits perfectly. So much easier to change. My order was processed immediately and I received it very fast. You are the best!
Verified Buyer
as always on time
good service
Verified Buyer
Filter buying experience
The filters are of very high quality and they were delivered quickly and in good condition.
Verified Buyer
Good deal!
Good Quality, good price, good company.
Verified Buyer
Excellent quality and fairly priced!
Excellent quality and fairly priced!
Verified Buyer
Customer service was outstanding in
Customer service was outstanding in correcting my mistake in the shipping address. Filters work great.
Verified Buyer
Looking for a hard to find size
This is the only place I found the correct size for my heater/air filter.
Verified Buyer
Air conditioner filter
Great filters. Great service.
Verified Buyer
Works fine.
Works fine.
Verified Buyer
Seabee
Perfect fit for odd /non common shape air handler.
Verified Buyer
Filters fit perfectly
Filters fit perfectly
Verified Buyer
Great service and product was
Great service and product was the right one as presented.
Verified Buyer
Filters
Arrived quickly and were just what we needed!
Verified Buyer
Fast delivery with odd sized
Fast delivery with odd sized filters
Verified Buyer
Smooth transaction again
Smooth website, transaction and delivery. Thanks!
Verified Buyer
Everything great so far
Everything great so far
Verified Buyer
Richard
Delivered on time, correct size, fair price
Verified Buyer
Great filters and service
Great filters and service
Verified Buyer
Perfect fit
My AC has an odd size aluminum filter. So, I found the exact size in a disposable. The fit is dead on and the filter works well. Quick shipping too when I run low.
Verified Buyer
Exactly what we wanted!
We were having problems finding a filter the size we needed. These were a perfect fit and great quality. Well priced as well.
Verified Buyer
alll very good...arrived on time
alll very good...arrived on time .....good condition
Verified Buyer
good value, delivers as promised, easy to deal with
even on odd sized filters, these guys are quick .... great value
Verified Buyer
Custom filter
Perfect fit
Verified Buyer
A++++
A++++
Verified Buyer
All good
All good
Verified Buyer
The site makes it easy
The site makes it easy to find the filter needed and the product is good
Verified Buyer
Filter buy
Very nice great filters
Verified Buyer
I AM VERY HAPPY WITH
I AM VERY HAPPY WITH PURCHASE I MADE.
Verified Buyer
HVAC Filters
Extensive selection of sizes to fit nearly every application. Easy to use website. Fast delivery. Quality filter.
Verified Buyer
Will always order my filters here!
Even though my ac is new it requires a custom filter. I found fitlerbuy and will never buy a cut yourself filter ever again. Shipping is super fast, and you can't beat the prices. I have only called their customer support once, but received excellent service. Very happy with my purchase.
Verified Buyer
Filter purchase
No problems at all in purchasing filters. They arrived in fine shape in a few days.
Verified Buyer
Service is always great
Service is always great
Verified Buyer
Fantastic Price, Quality and Service!
The title above says it all except for the FREE SHIPPING! I want to mention that! Having been a steady customer for over 2 years, I would recommend this product line to anyone!
Verified Buyer
filters
great filters, fast shipping and great pricing. I will buy more as needed
Verified Buyer
Quick & Easy
I ordered custom sized filters and they arrived in just a few short days.
Verified Buyer
Hvac filter
Excellant
Verified Buyer
Easy to order.
Order on line was easy and a fast delivery. Great customer service.
Thanks.
Verified Buyer
Thanks for speedy and accurate
Thanks for speedy and accurate shipment
Verified Buyer
Everything is good
Everything is good
Verified Buyer
Regular Customer
Great products and fast service.
Verified Buyer
Happy with service
The good thing about ordering here is the quick response and shipping.
Verified Buyer
Hard to find sizes always
Hard to find sizes always available
Verified Buyer
Customer service was very friendly,
Customer service was very friendly, and very helpful when I called for help on my purchase. My new filters fit great, will order from you again.
Verified Buyer
Great service, quick delivery.
Great service, quick delivery.
Verified Buyer
DENNIS GUY
GOOD
Verified Buyer
Excellent service and quality
We regularly order from FilterBuy as they carry a great selection of the odd size filter our HVAC system requires. Prices are very good and shipping is free. Our recent order order arrived short 2 filters. I emailed customer service, had an almost immediate response and the filters arrived the next day. I believe the true test of a company's commitment to quality is how issues are resolved. TireBuyer exceeded my expectations!
Verified Buyer
As advertised
As advertised
Verified Buyer
Haven't used yet
Haven't used yet
Verified Buyer
Pleased with the product!
Pleased with the product!
Verified Buyer
Very efficient, easy to understand
Very efficient, easy to understand site and fair prices. Also very quick delivery
Verified Buyer
Great experience and customer service!!!
Great experience and customer service!!!
Verified Buyer
Easy to order. Exact dimensions,
Easy to order. Exact dimensions, arrived swiftly.
Verified Buyer
Filter Buying helpful and simple
Filter Buying helpful and simple
Verified Buyer
Good quality. Arrived early
Good quality. Arrived early
Verified Buyer
Efficient ordering, great service
Super easy ordering process. Filters arrived within 3 working days. Awesome service!
Verified Buyer
air filters ordered 2/1/2018
The 1st set of filters were the incorrect dimensions( my fault). I appreciate the refund. The 2nd set I just ordered on 2/14/2018 should be good. Thank you.
Verified Buyer
Thank you. Great product and
Thank you. Great product and fast shipping
Verified Buyer
Unique size filters
Needed a special size filter. Filter Buy was able to fill my order and delivered them quickly. Loved how easy it was to get a custom size!
Verified Buyer
Filters fit perfectly and it
Filters fit perfectly and it was a quick and efficient delivery with excellent service!!
Verified Buyer
Great value and quality
Great value and quality
Verified Buyer
Satisfied Customers!
We recently moved into an older home with an oddly-shaped return. We could not find any filters to fit, and we settled for using those re-usable ones that you can cut to size? Let's be honest though, we did not change/wash that filter as often as we needed to...gross!! So, we decided to give Filter Buy a try. They were able to customize our filters for a reasonable price, and they fit perfectly! The website was easy to use, and the shipping was fast AND free! We signed up for automatic deliveries so that we never miss changing our air filters again. Very satisfied and would highly recommend.
Verified Buyer
Couldn’t find this size anywhere locally
Because we could not find a decent air filter for the odd size required on the air handler on our A/C system we had been using the blue plastic mesh filter the builder installed on our new home. The dust flying in the air was just ridiculous. The best I could do was wash the filter periodically with a hose outside and reinstall it. I looked online and never found a site that offered what I needed at a decent price. One day I heard a radio commercial for FilterBuy and immediately searched for the size we needed. We had a match! I placed an order and within 3 or 4 days I had our filters. They fit perfectly and have been working really well. A few days later I wiped the dust from areas where it had previously collected in order to see if the filters made a difference. Success! Nice job guys...
Verified Buyer
They fit
They fit
Verified Buyer
Great company
Product works and fits perfectly. Each order I make is always shipped promptly. Thank you and keep up the good work.
Verified Buyer
Perfect
We have a new Carrier AC unit with an unusual filter dimension. FilterBuy has the exact size, and a good quality product too
Verified Buyer
Easy to buy the correct
Easy to buy the correct filters
Verified Buyer
X
X
Verified Buyer
Filters
Every thing was great
Verified Buyer
FilterBuy is fantastic!
Ordered a six pack after I could not purchase my filter size on Amazon. FilterBuy made mine and I had them in 3 days. Very happy and impressed!
Verified Buyer
they fit to tight. haven't
they fit to tight. haven't checked the new as of yet, I will let you know
Verified Buyer
good prduct
good prduct
Verified Buyer
perfect
everything in this purchase was a+. Quick delivery, price, and tracking.
Verified Buyer
Excellent
Excellent
Verified Buyer
ok
ok
Verified Buyer
Excellent product, ease to place
Excellent product, ease to place order, fast shipping.
Verified Buyer
Great!
Great!
Verified Buyer
I've been looking for filters
I've been looking for filters for my a.c., but I couldn't find the size I needed anywhere. Filter buy allow me to get my customized filters at a great price and with fast shipping. I also love the option of having them automatically delivered every 6 months.
Verified Buyer
Great fast service!
Great fast service!
Verified Buyer
getting expensive
getting expensive
Verified Buyer
Have not used them yet,
Have not used them yet, but last order worked well.
Verified Buyer
Perfect price,perfect fit.
Perfect price,perfect fit.
Verified Buyer
We are very satisfied
We are very satisfied
Verified Buyer
Very prompt delivery. Filter working
Very prompt delivery. Filter working perfectly. Thanks so much for carrying this off-size filter.
Verified Buyer
I ordered the size the
I ordered the size the air conditioner company told me to get but the 2 I ordered were not the right size so I had to cut some off of both of them .
Next time I order I will know the right size to order.
Verified Buyer
I have not installed yet
I have not installed yet but looks like good quality and proper size with reasonable delivery timeframe
Verified Buyer
Excellent service. Highly recommended!
Excellent service. Highly recommended!
Verified Buyer
Just perfect fitting for our
Just perfect fitting for our A/C unit.
Verified Buyer
Good!
Good!
Verified Buyer
So far so good. Can't
So far so good. Can't complain.
Verified Buyer
The new filters will not
The new filters will not be used for another month and a half.
Verified Buyer
no problems
no problems
Verified Buyer
OK. The service was good.
OK. The service was good. Filters are what we expected.
No surprises, which is even better.
Verified Buyer
Very pleased with the quality
Very pleased with the quality of the filters and happy to get a "short-term" filter that's an unusual size. Thanks!
Verified Buyer
Very quick service. Excellent filter.
Very quick service. Excellent filter. Fit perfectly. Thanks.
Verified Buyer
Easy and convienet
Easy and convienet
Verified Buyer
I needed a special size
I needed a special size AC filter unavailable in our local store--was lucky to find it here. The filters differ in cost and quality, explicity contrasted on the site. Service was quick and reliable. I would definitely recommend and reorder.
Verified Buyer
Good, they fit great and
Good, they fit great and are much better than the sponge type I had to use before
Verified Buyer
i was confused by the
i was confused by the three different sizes print on the filter, but it was the right filter when i measure
Page 1 of 16
Is it Time to Change Your Filter?
Generally, we recommend you replace your air filters every 90 days. Find out below if you should change your filters more often.
If someone in your home has asthma and/or allergies...
Change your filter every 6 weeks to ensure indoor air quality is at its best.
If you have pets...
Change your filter every 2 months to avoid shedding and odor buildup.
If you have young children...
Change your filter every 2-3 months, as having clean air is even more important with children in your home.
Simply measure the length and width of your filter with a tape measure and choose the closest size
(to 1/8”) in the drop down menu. 1/8” tolerance is standard and should not cause a problem in any
standard filter application.
Please note that the ‘actual’ filter size, ie the size that your tape measure shows, should be used when
creating a filter with this tool, not a nominal filter size. Note that the depths of each filter are
standard, as shown to the right.
Simply measure the length and width of your filter with a tape measure and choose the closest size
(to 1/8”) in the drop down menu. Please note that the filter depth is standard.