21x23_1/2x1 MERV 10 Plus Carbon AC Furnace Filters 6 Pack spl_hf Mix well then add remaining

Mix well then add remaining fertilizers and additives

Nordic Pure 20x30x2 MERV 7 Plus Carbon air filters are made of electrostatically charged synthetic materials with an added flat panel infused with activated charcoal that attracts and capture most airborne particulates in your home

Description: Patented

and those who prefer intermittent mixing

21x23_1/2x1 MERV 10 Plus Carbon AC Furnace Filters 6 Pack spl_hf Mix well then add remainingNordic Pure Custom MERV 10 Plus Carbon air filters are made based on the actual measurements so be sure to measure your current filter to get the EXACT dimensions before ordering. As with all Nordic Pure filters, the effective life of your filter depends on the environment in which you live. We recommend changing 1 and 2 filters every 30 90 days. Our 4, 5 and 6 inch thick filters could last up to 6 months. EXACT MEASUREMENT: Furnace and air condition