17_1/2x21x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack bio-organic fertilizer It has reached these remarkable

It has reached these remarkable concentrations while still remaining a 100% soluble liquid and surpasses even the closest competition

Easy on the eyes

The 440C stainless steel blade contains more carbon for excellent hardness and edge retention

BotryStop WP is the biological fungicide that works with nature — not against it — to outcompete gray mold

17_1/2x21x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack bio-organic fertilizer It has reached these remarkableNordic Pure Custom MERV 13 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