20x25x4 (3 5/8) Pleated MERV 8 Air Filters 1 Pack ventilation/air-conditioning Color coordinated by size for

Color coordinated by size for easy organization

Is the RAY44 compatible with third-party dimmers and controllers

separately or in conjunction with most pesticides and fertilizers

The backbone of the Summit system is the Summit ballast

gradually warming up your plants just as Mother Nature does

20x25x4 (3 5/8) Pleated MERV 8 Air Filters 1 Pack ventilation/air-conditioning Color coordinated by size forImportant 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 20x25x4 filter