21x21x1 MERV 7 AC Furnace Filters 6 Pack Promote With the ability to stack

With the ability to stack vertically in carts and shelving or daisy-chain horizontally across a rack or rolling table

Strength was specially formulated to work with the Growth Science nutrient regimen to reduce stress while providing additional potassium at the early flowering stage to help the plant meet increased nutrient demands

with a balanced calcium and nitrogen ratio

Hermetically sealed to maintain freshness

Control temp & humidity independently or synchronized

21x21x1 MERV 7 AC Furnace Filters 6 Pack Promote With the ability to stackNordic 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