20x25x4 (3 5/8) Furnace Air Filters MERV 8 Pleated Plus Carbon 2 Pack hydro-systems has been naturally processed into

has been naturally processed into a zero nitrogen and high phosphorus fertilizer that will aid in focusing the plant's energy on the production of flowers

up through 1/3 HP (10 max

and fit into metal or flex ducts

Reduces humidity to desired level

Expand & Plant Organic Coir Granules with Microbes & Nutrients 10 lbs fills 2 cu

20x25x4 (3 5/8) Furnace Air Filters MERV 8 Pleated Plus Carbon 2 Pack hydro-systems has been naturally processed intoImportant 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 20x25x4 filter