18x24x 1/2 Half Inch Ring Panel MERV 10 Furnace Air Filters 12 Pack Environmental Controllers The Active Air CO2 Test

The Active Air CO2 Test Kit is an inexpensive alternative to costly electronic monitors

Adjust to pH to proper levels after mixing all fertilizers and additives

Electrifying

Use with water only

The reflective cup design makes the lighting more concentrated

18x24x 1/2 Half Inch Ring Panel MERV 10 Furnace Air Filters 12 Pack Environmental Controllers The Active Air CO2 TestNordic 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