16x20x4 (3 5/8) Furnace Air Filters MERV 8 Pleated Plus Carbon 1 Pack pest-and-disease-control keep your crops free from

keep your crops free from pests

and the indoor comfort level

Eriophyid Mites

Multiple Zones

16x20x4 (3 5/8) Furnace Air Filters MERV 8 Pleated Plus Carbon 1 Pack pest-and-disease-control keep your crops free fromImportant 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 16x20x4 filter