18x18x 1/2 Half Inch Ring Panel MERV 13 Furnace Air Filters 6 Pack food-&-water-storage Post-harvest lab results show the

Post-harvest lab results show the improved yield does NOT adversely affect potency and there is no indication of residue

Available in 3/8" quick connect for the Merlin Garden Pro & Tall Boy

The superior full-spectrum color output is easy on your eyes and provides proper visual color in your work area

Maintains a constant flow rate even on hillsides or long circuits

What does micron sizes mean

18x18x 1/2 Half Inch Ring Panel MERV 13 Furnace Air Filters 6 Pack food-&-water-storage Post-harvest lab results show theNordic 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