14x20x 1/2 Half Inch Ring Panel MERV 10 Furnace Air Filters 12 Pack chillers-heaters-and-purification adjust settings and calibrate by

adjust settings and calibrate by a simple push of a button

allowing you to run either halide or HPS lamps with the flip of a switch

dynamic graphing

while allowing air to travel into the root system

14x20x 1/2 Half Inch Ring Panel MERV 10 Furnace Air Filters 12 Pack chillers-heaters-and-purification adjust settings and calibrate byNordic 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