20x20x4 (3 5/8) Furnace Air Filters MERV 12 Pleated Plus Carbon 2 Pack ventilation and ducting Nordic Pure 16x30x2 MERV 8

Nordic Pure 16x30x2 MERV 8 Plus Carbon air filters are made of a dual material where the MERV rated material has been fused together with a carbon layer

Each controller incudes two temperature and humidity sensors (one for each zone)

high-phosphorus bat guano

Mix Promis Multi-Purpose Fungicide with water and uniformly apply (foliar spray) to all parts of the plant to point of runoff

Can be used on the day of harvest - just wait for it to dry before entering the treatment area

20x20x4 (3 5/8) Furnace Air Filters MERV 12 Pleated Plus Carbon 2 Pack ventilation and ducting Nordic Pure 16x30x2 MERV 8Important 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