17x27x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack DUCTWORK Balanced high-nitrate to ammoniacal nitrogen

Balanced high-nitrate to ammoniacal nitrogen ratio to prevent excessive stem elongation

3 in | Airflow: 52 CFM | Noise: 18 dBA | Bearings: Dual Ball

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virgin forest material composted with livestock manure

Designed for heavy duty clearing & scrubbing of tough vines weeds undergrowth & small saplings

17x27x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack DUCTWORK Balanced high-nitrate to ammoniacal nitrogenNordic Pure Custom MERV 12 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