Airteva AC, Furnace Filter With (1) Biosponge Plus Replacement Pad (18 X 20 x 1)Actual Size: 17 3/4 x 19 3/4 x 3/4"

Provides maximum protection against airborne contamination Includes a permanent aluminum frame and a BioSponge Plus refill Simple to use and easily fits all makes and models of furnaces and air conditioners in any size available Backed by a 10 year warranty, making it potentially the last furnace filter you'll ever need to purchase Made from extruded heavy-duty aluminum with a patented Leak-Guard seal to ensure 100% air filtration BioSponge Plus filter pads eliminate the filter as a potential breeding ground for microorganisms and control airborne germs with its Ageis microbe shield Special dual density design allows for an extended 60-day filter life Replacement is easy - just peel out the soiled pad and replace it with a fresh one