20x20x4 (3 5/8) Furnace Air Filters MERV 8 Pleated Plus Carbon 1 Pack control system When is the best time

When is the best time to apply Sluggo

Within 4-6 weeks

This 24” polypropylene bouffant provides a particulate barrier and helps prevent hair from contaminating a product or work environment

and Cylindrocladium

Azotobacter vinelandii

20x20x4 (3 5/8) Furnace Air Filters MERV 8 Pleated Plus Carbon 1 Pack control system When is the best timeImportant 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