20x25x4 (3 5/8) Pleated MERV 13 Air Filters 2 Pack CO2 each channel (Zone) can either

each channel (Zone) can either control the same-powered LED drivers

Introducing Flowers in the Vegetative stage will ensure a robust product down the road

Grow Big and Tiger Bloom

This filter lasts for up to 1000 gallons before it has to be replaced

Compact plugin size

20x25x4 (3 5/8) Pleated MERV 13 Air Filters 2 Pack CO2 each channel (Zone) can eitherImportant 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