20x25x4 (3 5/8) Furnace Air Filters MERV 8 Pleated Plus Carbon 2 Pack Environmental Controllers This state of the art

This state of the art fixture uses the highest quality Samsung diodes

Reduces biofilm - Keep lines clear of dangerous organic material

Helps stimulate flower development in the final bloom stage

Rove Beetles are a soil-dwelling general predator that feeds on the larvae of fungus gnats

Philips AGRO Plus 1000W 400V DE Lamp

20x25x4 (3 5/8) Furnace Air Filters MERV 8 Pleated Plus Carbon 2 Pack Environmental Controllers This state of the artImportant 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