16x20x4 (3 5/8) Pure Carbon Pleated Odor Reduction Merv 8 Furnace Filters 6 Pack Travel Bags & Backpacks • Improves nutrient absorption rates

• Improves nutrient absorption rates

such as ebb & flow

Now comes in a bulk pack too

Internal Control Board: Manages the complete operation of the humidifier

It can measure up to 10

16x20x4 (3 5/8) Pure Carbon Pleated Odor Reduction Merv 8 Furnace Filters 6 Pack Travel Bags & Backpacks • Improves nutrient absorption ratesImportant 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