12x20x 1/2 Half Inch Ring Panel MERV 12 Furnace Air Filters 6 Pack grow-systems-trays-reservoirs 02 pH pH Calibration Automatic

02 pH pH Calibration Automatic

The Max-Fan® Pro Series is even more efficient and stronger than the original Max-Fan® design

Even Light Distribution: Precisely designed to deliver uniform levels of photosynthetic flux density (PPFD)

Is the handle comfortable and safe to use in the field

12x20x 1/2 Half Inch Ring Panel MERV 12 Furnace Air Filters 6 Pack grow-systems-trays-reservoirs 02 pH pH Calibration AutomaticNordic 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