20x20x4 (3 5/8) Pure Carbon Pleated Odor Reduction Merv 8 Furnace Filter 1 Pack discounted 000 hour life expectancy (8760

000 hour life expectancy (8760 hours in a year—replacement every year is recommended)

This new addition to the Oakton EcoTestr product line features updates to make measuring water quality easier and faster

This is part A

Pure is environmentally friendly

• Flush mount hardware: 2 flush mount clips

20x20x4 (3 5/8) Pure Carbon Pleated Odor Reduction Merv 8 Furnace Filter 1 Pack discounted 000 hour life expectancy (8760Important 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