20x20x4 (3 5/8) Pleated Air Filters MERV 13 Plus Carbon 6 Pack HVAC & HOME VENTILATION 8 x Matrix Circulator |

8 x Matrix Circulator | 2 1/4"

Multifaceted design provides superior light uniformity

Two square obeservation windows on the front door

economy and extend longevity

This ethanol extraction unit can process up to 120 pounds an hour of material

20x20x4 (3 5/8) Pleated Air Filters MERV 13 Plus Carbon 6 Pack HVAC & HOME VENTILATION 8 x Matrix Circulator |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