20x21_1/2x1 Exact MERV 14 AC Furnace Filters 6 Pack sprayers-and-wands all essential micro- and macronutrients

all essential micro- and macronutrients are covered — no additives needed

• Conductivity probe with 1' NPT thread

- Everything you need to control a small or medium sized indoor facility

Works on all varieties

• Contains optimum levels of phosphorus and potassium

20x21_1/2x1 Exact MERV 14 AC Furnace Filters 6 Pack sprayers-and-wands all essential micro- and macronutrientsNordic 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.