20x25x4 (3 5/8) Furnace Air Filters MERV 8 Pleated Plus Carbon 6 Pack post harvest the 1000W COOL encourages increased

the 1000W COOL encourages increased internodes while maintaining compact growth

250 Mini Blocks (AKA 150 strips)

Key Features:

Works best in warm weather (60°F+)

20x25x4 (3 5/8) Furnace Air Filters MERV 8 Pleated Plus Carbon 6 Pack post harvest the 1000W COOL encourages increasedImportant 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