20x30x 1/2 Half Inch Ring Panel MERV 8 Furnace Air Filters 6 Pack plant-support Use with the HI981421 GroLine

Use with the HI981421 GroLine Monitor to provide around-the-clock

This kit contains 4" flanges that will allow you to set  up air-cooling of two Powerhouse ballasts or a Daystar DAUN reflector

The sturdy frame construction helps support the weight of the vines as they grow

They feature unique

Secondary Lights (5 each

20x30x 1/2 Half Inch Ring Panel MERV 8 Furnace Air Filters 6 Pack plant-support Use with the HI981421 GroLineNordic 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