20x25x4 (3 5/8) Furnace Air Filters MERV 8 Pleated Plus Carbon 2 Pack Grow Light Bulbs root weevils

root weevils

Perfect for the transition period between veg and flower

This horizontally mounted dual CMH provides much higher amounts of plant loving UV and spectrum

balancing the color spectrum with a high-quality Carl Zeiss lens for insane optical clarity when used under HPS (High Pressure Sodium) lights

20x25x4 (3 5/8) Furnace Air Filters MERV 8 Pleated Plus Carbon 2 Pack Grow Light Bulbs root weevilsImportant 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