20x25x 1/2 Half Inch Ring Panel MERV 7 Furnace Air Filters 12 Pack fans-ventilation-ducting Reapply after 5–7 days if

Reapply after 5–7 days if needed for especially tough or established weeds

most efficient Active Air filter in your grow room

• Auto off function

Application Timing: When grubs are actively feeding in the soil

keeping humidity in check even in large

20x25x 1/2 Half Inch Ring Panel MERV 7 Furnace Air Filters 12 Pack fans-ventilation-ducting Reapply after 5–7 days ifNordic 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