20x20x4 (3 5/8) Furnace Air Filters MERV 12 Pleated Plus Carbon 2 Pack Lighting Accessories Elite CalMag ensures that the

Elite CalMag ensures that the most common nutrient deficiencies are handled with one treatment

leather padded and strong steel frame rim

spray Good Bug Power Meal onto plants in the area as a supplementary food source

full-size dimensions and volume to provide maximum growing area

Flora Pipe Fitting 1" - T

20x20x4 (3 5/8) Furnace Air Filters MERV 12 Pleated Plus Carbon 2 Pack Lighting Accessories Elite CalMag ensures that theImportant 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