20x20x4 (3 5/8) Pleated MERV 7 Air Filters 6 Pack -power-&-lamp-cords Replaceable sensor lets you reuse

Replaceable sensor lets you reuse meter body many times over

copper sulfate

which are natural wetting agents

Reduce the application interval to 3-5 days if insects get out of hand

Average flow rate with water (SF Models Only): 45 lph

20x20x4 (3 5/8) Pleated MERV 7 Air Filters 6 Pack -power-&-lamp-cords Replaceable sensor lets you reuseImportant 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