16x20x4 (3 5/8) Pleated MERV 14 Air Filters 6 Pack Light Fixture • Temperature heating range: 64°F

• Temperature heating range: 64°F to 89°F

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- Two separate electrical outlets for temperature and humidity control equipment

acidic buffer lowers water and nutrient solution pH

16x20x4 (3 5/8) Pleated MERV 14 Air Filters 6 Pack Light Fixture • Temperature heating range: 64°FImportant 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