12x16x1 MERV 8 Plus Carbon AC Furnace Filters 6 Pack spl_hlg There is also an extra

There is also an extra port/valve for inert gas usage

Perfect for hydroponics

0 PPM water

Fits both conventional and organic production

NEW from General Hydroponics

12x16x1 MERV 8 Plus Carbon AC Furnace Filters 6 Pack spl_hlg There is also an extraNordic Pure pleated AC air filters are made of electrostatically charged synthetic materials that attract and capture most airborne particulates in your home or office. Each time air passes through a Nordic Pure pleated furnace filter, lint, household dust, pollen, dust mites, pet dander, baking flour, mold spores and other contaminants are removed. Our filter media prevents the growth of bacteria or mold, resulting in a much healthier living space.