13x20x1 Exact MERV 7 AC Furnace Filters 12 Pack biological fertilizer works best in warm weather

works best in warm weather above 60°F

Pruner cuts up to 3/8-inch thick green wood

12" unit with three corona discharge cells

Automatic Calibration - The Checker Plus is calibrated automatically to one or two points

Bluelab pH Probe KCl Storage Solution is available in 100 ml bottles only

13x20x1 Exact MERV 7 AC Furnace Filters 12 Pack biological fertilizer works best in warm weatherNordic 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