16x20x4 (3 5/8) Pleated MERV 13 Air Filters 2 Pack grow-light-reflectors it creates an excellent outdoor

it creates an excellent outdoor medium

Shore flies

remediate toxins present in soil and water

CO2 (PPM) sensor and photocell to create the perfect all-in-one environmental sensor

KALIX Silica is pH-neutral and beneficial to soil microbes

16x20x4 (3 5/8) Pleated MERV 13 Air Filters 2 Pack grow-light-reflectors it creates an excellent outdoorImportant 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