20x25x4 (3 5/8) Furnace Air Filters MERV 8 Pleated Plus Carbon 6 Pack Plant Care/Pest & Disease Control Temperature Range: 0-59

Temperature Range:                             0-59

which allows simple identification of multiple strains of cuttings

The traditional commercial overlap reflector is designed to work on a 5' center application in conjecuntion with other DE fixtures

The 1 hour on in between off period fools the plants that stay in vegetative growth state

20x25x4 (3 5/8) Furnace Air Filters MERV 8 Pleated Plus Carbon 6 Pack Plant Care/Pest & Disease Control Temperature Range: 0-59Important 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