16_1/4x21_1/4x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack air-purification Do not use with A

Do not use with A

The ACF18 is ETL-listed for safety

Switch parameters at the touch of a button

You also have the ability to halve the power

16_1/4x21_1/4x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack air-purification Do not use with ANordic Pure Custom MERV 14 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