16x20x4 (3 5/8) Pure Carbon Pleated Odor Reduction Merv 8 Furnace Filters 6 Pack Grow System/ Trays/ Reservoirs A Tailored Growing Experience

A Tailored Growing Experience

Patterned after our popular Raptor reflector

5°C /±1°F Calibration automatic

A key feature of the AWOL backpacks is the closure system

moth fly and pupae of thrips and springtails

16x20x4 (3 5/8) Pure Carbon Pleated Odor Reduction Merv 8 Furnace Filters 6 Pack Grow System/ Trays/ Reservoirs A Tailored Growing ExperienceImportant 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 16x20x4 filter