18_1/4x22x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack hawthorne and 109mm cones

and 109mm cones

Improve Eciency

NOTE: Can be linked to the APE4100 and other controllers to disable the CO2 output when exhaust fans are in operation (optional 24V adapter included)

Package Includes - 1x PT120 PRO light

18_1/4x22x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack hawthorne and 109mm conesNordic 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