13x25x1 MERV 14 AC Furnace Filters 12 Pack Controllers Ceramic Metal Halide or CMH

Ceramic Metal Halide or CMH for short (some refer to it as CDM)

these racks will fit any grow room situation

and greenhouses in mind

the upgrade also includes a silencer that offers 30% noise reduction

13x25x1 MERV 14 AC Furnace Filters 12 Pack Controllers Ceramic Metal Halide or CMHNordic Pure MERV 14 Pleated AC Furnace Air Filters provide exceptional filtration for both home and commercial environments. Each time air passes through a Nordic Pure pleated furnace air filter, lint, dust, pollen, bacteria, pet dander, dust mites, mold spores, smoke particles, virus carriers, coughs and sneezes, smog, allergens and other contaminants are removed. MERV 14 furnace filters are comparable to HVAC filters with the rating of MPR 2800.