20x20x4 (3 5/8) Pleated MERV 14 Air Filters 2 Pack Growing Media The program can also be

The program can also be manually set the fans to run continuously or on a timer at custom speeds

The 913024D comes with our Patented Fan System which helps in reducing water temperature

Constructed of aluminum and thermoplastic

The 18'' x 18'' x 16'' large size will fit a Medium box perfectly along with many other package styles

Easy to Install

20x20x4 (3 5/8) Pleated MERV 14 Air Filters 2 Pack Growing Media The program can also beImportant 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