20x25x1 (19.5 x 24.5) Accumulair Platinum 1-Inch Filter (MERV 11) (4 Pack)
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My mom has severe allergies and gets sick quickly if the air is clogged and unfiltered. She got this on Christmas and she felt as if this helped her a lot. She got an extra one just in case they stop producing them. But overall this has been of a lot of help and maybe if your skeptical of buying this don't doubt it.
Great for people who have pets, and allergies. Allergies are a pain in my house these help.