13x21x1 Exact MERV 13 AC Furnace Filters 6 Pack Hydro Components the LED indicator lights up

the LED indicator lights up on the control panel and the emergency shut-off valve automatically shuts down the system

The Magnum 18 also features a special hydrophobic coating on the coils which prevents fungal and calcium buildup

1 Year warranty

San Jose Scale

The #3 measures around 1/2 in and the Coarse is about 1/8 to 1/4 in

13x21x1 Exact MERV 13 AC Furnace Filters 6 Pack Hydro Components the LED indicator lights upNordic Pure MERV 13 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 13 furnace filters are comparable to HVAC filters with the rating of MPR 2200