18x18x 1/2 Half Inch Ring Panel MERV 12 Furnace Air Filters 6 Pack additives - Runs MH/HPS bulbs

- Runs MH/HPS bulbs

They're washable

Strong UV peaks for increased resin production

single plant helper is deal for the hobbyist who demands premium results

18x18x 1/2 Half Inch Ring Panel MERV 12 Furnace Air Filters 6 Pack additives - Runs MH/HPS bulbsNordic 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