17x27x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack DUCTWORK 3 in | Airflow: 52

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

Outside Diameter: 10 cm / 4"

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Elastic wrists

Monitor flow rate over time

17x27x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack DUCTWORK 3 in | Airflow: 52Nordic 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