20x25x4 (3 5/8) Pleated MERV 8 Air Filters 1 Pack ventilation/air-conditioning automatic start / stop /

automatic start / stop / clear functions

The backbone of the Summit system is the Summit ballast

When readings appear sluggish

Support your plants with our plant yo-yo

separately or in conjunction with most pesticides and fertilizers

20x25x4 (3 5/8) Pleated MERV 8 Air Filters 1 Pack ventilation/air-conditioning automatic start / stop /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 20x25x4 filter