20x20x4 (3 5/8) Furnace Air Filters MERV 10 Pleated Plus Carbon 6 Pack rock-bottom 5" rubber reducer with clamps

5" rubber reducer with clamps included

Behind the unit are ports that can control up to six individual AC Infinity AIRPLATE Cabinet fans and MULTIFAN Component fans

We've incorporated DYNOMYCO® into every transplant cycle and the difference in early establishment is clear

Fully waterproof and less fragile than all-glass electrodes because of its tough polypropylene barrel

Total micronutrient complex

20x20x4 (3 5/8) Furnace Air Filters MERV 10 Pleated Plus Carbon 6 Pack rock-bottom 5" rubber reducer with clampsImportant 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