Think Crucial 3 Replacements for Honeywell 20x25x5 FC100A1037 Merv 8 Furnace Air Filter HIGH QUALITY AIR FILTER that can replace your Honeywell FC100A1037 Air Purifier's Filter. Get back to breathing clean air again! EASY TO INSTALL so you can get back to breathing clean air as soon as possible! Simply remove your old filter and put this brand new one in it's place! This filter has a Merv 8 rating. HEALTHIER LIFESTYLE! No one wants to breathe in dirty air and if you don't clean your air filter that will be exactly what you'll be doing! Replacing your filter will help clean your air and allow for a healthier lifestyle! The dimensions are 20x25x5 (20 x 25 x 5). SAVE MONEY by using a new air filter! When your Honeywell Air Cleaner has a clogged or dirty air filter it can cause it to work harder which will end up hurting your electric bill! This filter fits F100, F200 & SpaceGard 2200 air purifiers. GUARANTEED SATISFACTION because of a 30 day full money bank guarantee and a trusted Think Crucial warranty. We are so confident in our products that we have no problem giving you every penny back if you're unhappy with your purchase. You won't see promises like that from big box brands!