12x24x 1/2 Half Inch Ring Panel MERV 12 Furnace Air Filters 12 Pack organic 4-hour when used as a

4-hour when used as a dip or dust

If it’s windy outside cover plants after application for about a half hour

All these improvements and still the same great price as the original version

0 & TerraGrow

Long-term preventive use ensures top results

12x24x 1/2 Half Inch Ring Panel MERV 12 Furnace Air Filters 12 Pack organic 4-hour when used as aNordic 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