20x20x4 (3 5/8) Pleated Air Filters MERV 7 Plus Carbon 6 Pack Misc Application Rates:

Application Rates:

use with Sonic Bloom and Killer Tea

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

environmental monitoring

and can be added to the hydroponic reservoir with confidence

20x20x4 (3 5/8) Pleated Air Filters MERV 7 Plus Carbon 6 Pack Misc Application Rates:Important 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