20x20x4 (3 5/8) Pleated MERV 10 Air Filters 2 Pack control system Engine RPM Range: 1800 –

Engine RPM Range: 1800 – 2000 RPM

Five 11" round ventilation sockets

Unlike tall trays

25-inch stainless steel cutting blade with a razor edge is lightweight and flexible

Iris Borer (Macronoctua onusta)

20x20x4 (3 5/8) Pleated MERV 10 Air Filters 2 Pack control system Engine RPM Range: 1800 –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