20x20x4 (3 5/8) Pleated MERV 15 Air Filters 2 Pack Chemicals Enhances plant functions at the

Enhances plant functions at the foliar level and the root zone in both soil and soilless substrates

Fabric passes ASTM F1670 and F1671 tests for protection against blood

which is FDA-approved and BPA-free

measuring 17 x 10

and 50 foot) these cords can handle up to 15 amps and 1800 watts adding extra length to almost all indoor lighting fixtures and many other grow room devices

20x20x4 (3 5/8) Pleated MERV 15 Air Filters 2 Pack Chemicals Enhances plant functions at theImportant 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