17x22x1 MERV 14 AC Furnace Filters 6 Pack DUCTWORK Supports a balanced nitrogen ratio

Supports a balanced nitrogen ratio to prevent excessive stem elongation

Standard Mounting comes in square

Improves uniform crop growth and overall crop quality that will produce higher yields

• Removes residual solvent to low ppm

What is air pruning and how does it help your garden

17x22x1 MERV 14 AC Furnace Filters 6 Pack DUCTWORK Supports a balanced nitrogen ratioNordic 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.