20x25x4 (3 5/8) Furnace Air Filters MERV 8 Pleated Plus Carbon 2 Pack Grow Light Bulbs These galvanized duct reducers can

These galvanized duct reducers can be used with fans

balancing the color spectrum with a high-quality Carl Zeiss lens for insane optical clarity when used under HPS (High Pressure Sodium) lights

replacing the traditional and inefficient flow rate adjustment attachments seen with most multi-port irrigation manifolds

Dry Contact Output:                     30VDC/250VAC

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20x25x4 (3 5/8) Furnace Air Filters MERV 8 Pleated Plus Carbon 2 Pack Grow Light Bulbs These galvanized duct reducers canImportant 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 20x25x4 filter