12x12x 1/2 Half Inch Ring Panel MERV 12 Furnace Air Filters 6 Pack vacuum The thin shutter blades automatically

The thin shutter blades automatically open when the duct fan runs and closes when not in use

When operating higher amperage units

per gallon of water with every watering

Hydro-X Plus System / HCS-3

and general watering throughout veg and grow

12x12x 1/2 Half Inch Ring Panel MERV 12 Furnace Air Filters 6 Pack vacuum The thin shutter blades automaticallyNordic Pure Half Inch Ring Panel AC Furnace Air Filters consist of an internal frame bonded between flat layers of two different types of electrostatically charged HVAC furnace filter media. The first layer is a high capacity, polyester filter material which acts as a pre filter, capturing large airborne particles. The second, more efficient, layer is a MERV rated smooth poly blend filter material. The electrostatic charge works as a magnet to draw in