20x20x4 (3 5/8) Furnace Air Filters MERV 8 Pleated Plus Carbon 6 Pack vacuum FirmGrip non-skid shoe covers are

FirmGrip non-skid shoe covers are designed for tough working environments

Not only are they non-toxic and often biodegradable

Fully sealed

and food processing facilities or anywhere that sanitation and disinfection are needed

20x20x4 (3 5/8) Furnace Air Filters MERV 8 Pleated Plus Carbon 6 Pack vacuum FirmGrip non-skid shoe covers areImportant Note: Almost ALL furnace filters have a different "actual size" than the nominal size printed on the air conditioner filter. It's best if you measure your air filter for the EXACT size and compare it to our "Actual Size" and then you can be sure your A C air filter fits! With the 4" and 5" air filters there is a wider variance between the nominal and actual size depending on the manufacturer. If you are replacing a 4 3 8 depth 20x20x4 filter