20x20x4 (3 5/8) Pure Carbon Pleated Odor Reduction Merv 8 Furnace Filters 6 Pack commercial-lighting-fixture Use the Autopilot CO2 generator

Use the Autopilot CO2 generator AC power adapter to provide AC power to an Autopilot CO2 generator

The oxygen rich solution helps build healthy root systems faster and more efficiently than soil which results in superior plant growth and higher yields in your overall production

Healthy microbial life in the rhizosphere helps both mobilize nutrients and benefit water and oxygen absorption in the root zone for faster and stronger growth

Compatible with many commonly used fertilizers

The mats protect the roots from exposure to direct light and elements that can damage roots and hinder growth

20x20x4 (3 5/8) Pure Carbon Pleated Odor Reduction Merv 8 Furnace Filters 6 Pack commercial-lighting-fixture Use the Autopilot CO2 generatorImportant 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 20x20x4 filter