20x20x4 (3 5/8) Pleated MERV 7 Air Filters 6 Pack Environmental Controllers The sap groove prevents the

The sap groove prevents the blade sticking when cutting sappy wood

Clear housing

5 21 21 15 HGDRRDP30 Commercial Dirt Pot by RediRoot #30

These continuous monitoring meters feature automatic temperature compensation

and to ventilate various air circulation and exhaust projects

20x20x4 (3 5/8) Pleated MERV 7 Air Filters 6 Pack Environmental Controllers The sap groove prevents theImportant 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