20x20x4 (3 5/8) Furnace Air Filters MERV 10 Pleated Plus Carbon 6 Pack rock-bottom Fully waterproof and less fragile

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

Total micronutrient complex

• 20 Amp Ballast

5" rubber reducer with clamps included

RAW Organic Hemp Cones are unquestionably the world’s best organic hemp cones

20x20x4 (3 5/8) Furnace Air Filters MERV 10 Pleated Plus Carbon 6 Pack rock-bottom Fully waterproof and less fragileImportant 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