16x20x4 (3 5/8) Furnace Air Filters MERV 8 Pleated Plus Carbon 1 Pack pest-and-disease-control Mix OMRI Listed RootShield Granules

Mix OMRI Listed RootShield Granules in your soil or media before planting to ensure that the developing roots of your new plants are protected against plant pathogenic fungi like:

and the indoor comfort level

a two-piece 2 meter (6’6”) Rail

This species has a relatively long life (several weeks) and is better able to handle high temperatures than the Aphidius species

16x20x4 (3 5/8) Furnace Air Filters MERV 8 Pleated Plus Carbon 1 Pack pest-and-disease-control Mix OMRI Listed RootShield GranulesImportant 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 16x20x4 filter