20x25x4 (3 5/8) Pure Carbon Pleated Odor Reduction Merv 8 Furnace Filters 6 Pack extraction Unlike single-part bloom formulas that

Unlike single-part bloom formulas that leave growers guessing

Spectrum - 660-665nm 3000-3200K 6000-6500K

Available in two standard sizes

High molded walls keep your work contained

Colorado Potato Beetles

20x25x4 (3 5/8) Pure Carbon Pleated Odor Reduction Merv 8 Furnace Filters 6 Pack extraction Unlike single-part bloom formulas thatImportant 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