20x20x4 (3 5/8) Pleated Air Filters MERV 7 Plus Carbon 6 Pack Commercial Lighting Concentrated

Concentrated

it will work its way towards the apex of plant

Adding Far-Red to the light spectrum can increase leaf size

Makes 25 Gallons of Solution

Rated for damp/wet conditions and offering industry-leading thermal management

20x20x4 (3 5/8) Pleated Air Filters MERV 7 Plus Carbon 6 Pack Commercial Lighting ConcentratedImportant 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