Accumulair FC21X23A_4 MERV 6 Rating Air Filter/Furnace Filters, 21x23x1 (Actual Size) - 4 pack

I was looking for the filter fit my house for time, from most of the big brand, not easy to get the proper size. This one is coming with the accurate size as it stated. The only concern, it looks and feels a little bit thin and soft, can not sure the performance. And all pieces are in one plastic, after opening and get one out, all others are in open status, have to seal the whole box again by yourself. But in general, glad to get the size I want.

These are 8x24x1A filters and they fit fine in my new return air filter grille... maybe a little tight, but that's better than loose. The only problem I have is that these were "bulk packaged" (photo). They came in a plain brown box and they were packaged without any inserts nor identifying marks other than size and airflow arrows. (I'm old-school and like to know that the product I ordered is the product I received.) These filters do appear sturdy and effective so I hope they will perform as I expect them to. Will update in 3 months when I swap-out.

I thought I ordered the wrong size, but sure enough my vent is 8 x 24 but the filters are about 1/8" too big. I have to tear the cardboard around the side off and stuff it into the vent. Probably bot the best thing to do. I ordered them twice and both times it was the same.

Don't you guys ever coordinate with the people who make the grilles these filters go in? There are hundreds of case makers for iPhones and the ALL FIT the phones, but now my filter is all bent up and crammed in the hole. !@#$! Very frustrated.

I have such an off the wall filter size that no stores near me carry this in stock. I placed it in the air handler and fit perfectly. The order came with 4 so i'll be set for a few months. I will reorder from this company.

These are the only filters I use now. They fit my opening perfectly, which is actually exactly 18x36...in retail stores what they call 18x36 isn’t. It’s smaller and my air handler sucks the filter right inside. These filters at Accumulair are the correct size and work very well with enough filtration to keep the air clean going to the air handler but not so fine I need to change it too frequently. I recommend these highly!

My A/C has an odd size for filters and I could not find them anywhere until I came across this manufacturer. No store had them in my size and the A/C maker no longer made them for my unit. They work excellent for my unit and are exactly as described. I'm putting these on my subscription list so that I order more when needed. Thanks Accumulair...saved me from having to go custom which sucks. Will be buying more.

They fit like charm. I like the exact fit. Most are not. This brand I have been using for almost 2 years and will continue to do so.