12x20x 1/2 Half Inch Ring Panel MERV 13 Furnace Air Filters 6 Pack Monitors & Timers It is suitable for indoor

It is suitable for indoor or outdoor domestic use (in pots or in automated systems) and for intensive soil-less cultivation in greenhouses

SNS-604A & SNS-604B enhance nutrient mineral uptake and transport in your plants

Ducting Size: 4” | Dimensions: 6

PLUG DIMENSION (LX W X D) - 1 3/4" X 1 3/4” X 1 1/2”

• Biodegradable

12x20x 1/2 Half Inch Ring Panel MERV 13 Furnace Air Filters 6 Pack Monitors & Timers It is suitable for indoorNordic 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