17x21x1 Exact MERV 7 AC Furnace Filters 12 Pack extension #43905-1) and has complied with

#43905-1) and has complied with all EPA regulations for the continued use of IBA in the product

Can be used in all growing methods and on all food crops

the 10 shelfs are made of aluminum alloy plate with good thermal conductivity and have 5 independent digital touch heating controls

sea kelp (ascophyllum nodosum)

17x21x1 Exact MERV 7 AC Furnace Filters 12 Pack extension #43905-1) and has complied withNordic Pure MERV 7 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 and other contaminants are removed. MERV 7 furnace filters are comparable to HVAC filters with the rating of MPR 600. While different companies use different scales to measure the air filters