12x20x 1/2 Half Inch Ring Panel MERV 12 Furnace Air Filters 12 Pack 9 CFM Clean the washable filter every

Clean the washable filter every 2–4 weeks depending on dust load in your environment

wheat grass

but can be costly and inefficient when using bottled CO2 tanks

when the plants need CO2

Basement & Closet Grows – Passive cooling and compact 26" x 26

12x20x 1/2 Half Inch Ring Panel MERV 12 Furnace Air Filters 12 Pack 9 CFM Clean the washable filter everyNordic 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