12x12x 1/2 Half Inch Ring Panel MERV 7 Furnace Air Filters 12 Pack lighting-accessories outside in fields or in

outside in fields or in greenhouses

For garden use only

Fits (2) 10"x20" propagation trays

and after a rain or irrigation when deficiency symptoms are present or during growth periods when additional calcium is needed

Pots dimensions: 5

12x12x 1/2 Half Inch Ring Panel MERV 7 Furnace Air Filters 12 Pack lighting-accessories outside in fields or inNordic 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