21 1/2x23x1 Exact MERV 7 AC Furnace Filters 6 Pack AIR FILTER BOXES This standard style reflector features

This standard style reflector features reflective material on all 4 sides

For heavy infestations

Zippered windows provide easy access and control over humidity and temperature

Capacities: 1/8 teaspoon

Enhances phosphate interaction with other plant nutrients

21 1/2x23x1 Exact MERV 7 AC Furnace Filters 6 Pack AIR FILTER BOXES This standard style reflector featuresNordic 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