20x20x4 (3 5/8) Pleated Air Filters MERV 7 Plus Carbon 2 Pack water-pumps-&-irrigation-supplies CO2 Deadband Range: 20-200 PPM

CO2 Deadband Range:                      20-200 PPM

Contact mode of action makes this a great choice as a resistance management tool

The Precision Blade Sharpener quickly sharpens your Hydrofarm Precision Pruners with a few easy strokes

What’s special about carbon

Large-scale greenhouse operations requiring consistent

20x20x4 (3 5/8) Pleated Air Filters MERV 7 Plus Carbon 2 Pack water-pumps-&-irrigation-supplies CO2 Deadband Range: 20-200 PPMImportant 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