23 1/2x25x1 Exact MERV 8 AC Furnace Filters 6 Pack biological fertilizer C:N Ratio: 3

C:N Ratio: 3

The Backpack measures 13

including use instructions when applying in mushroom houses

Twister T2 Control Box

23 1/2x25x1 Exact MERV 8 AC Furnace Filters 6 Pack biological fertilizer C:N Ratio: 3Nordic Pure MERV 8 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 8 furnace filters are comparable to HVAC filters with the rating of MPR 800. While different companies use different scales to measure the air filters