20x20x4 (3 5/8) Furnace Air Filters MERV 10 Pleated Plus Carbon 1 Pack gavita 1 x Smoke Detector (MBS-SD)

1 x Smoke Detector (MBS-SD)

• Boosts nitrogen levels to restore photosynthetic balance

You can even place film on tables or floors

SMITE will naturally biodegrade leaving minimal residue

20x20x4 (3 5/8) Furnace Air Filters MERV 10 Pleated Plus Carbon 1 Pack gavita 1 x Smoke Detector (MBS-SD)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