16x21x1 MERV 8 Plus Carbon AC Furnace Filters 6 Pack ac-/-dehumidification-/-humidification The SE CMH ballast delivers

The SE CMH ballast delivers a low frequency

It has a high torque while still retaining low power consumption with a motor that produces 101 lb-in of torque

Can improve nutrient uptake

Permanent Drainage Option – Can be plumbed directly for continuous

Ed Rosenthal is a world-renowned grower and educator who created decades-long Ask Ed growing advice column in High Times Magazine

16x21x1 MERV 8 Plus Carbon AC Furnace Filters 6 Pack ac-/-dehumidification-/-humidification The SE CMH ballast deliversNordic 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.