16x21_1/2x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack stocked • Great coverage—up to 13

• Great coverage—up to 13

It also allows for automatic operation to start or close when faucet is turned on or off

Random start uses an algorithm that will start the ballasts within a 0-15 second window

An ultra-quiet UL-certified blower system designed for cooling cabinets that requires minimal noise

smoke or pets

16x21_1/2x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack stocked • Great coverage—up to 13Nordic 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