13x18x1 Exact MERV 8 AC Furnace Filters 6 Pack garden-accessories 060 µmol/m2/s over a 4’x4’

060 µmol/m2/s over a 4’x4’ canopy

PfrSpec targets far-red wavelengths for photoperiod control and stem elongation

RETURNS: Custom AC furnace air filters are not returnable since we hand make them per your exact dimensions when you enter your air filter size above

or other soil-based media

• For fruit trees or grapes: apply at bud break

13x18x1 Exact MERV 8 AC Furnace Filters 6 Pack garden-accessories 060 µmol/m2/s over a 4’x4’Nordic 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