12x20x 1/2 Half Inch Ring Panel MERV 13 Furnace Air Filters 12 Pack biological fertilizer Flange: 10""

Flange: 10""

Research and trials have proven that phosphites increase flowering sites

No-Hassle Drainage – The positive pressure drain removes the need for a drain trap

and precise temperature readings with dual thermal probes and thermal-threshold auto dim-shutdown for additional protection

Can be stacked 2-up

12x20x 1/2 Half Inch Ring Panel MERV 13 Furnace Air Filters 12 Pack biological fertilizer Flange: 10""Nordic 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