12_1/2x23_1/2x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack environmental-controllers The Original Can-Filters are designed

The Original Can-Filters are designed for the control of VOCs (paint fumes

Whether used indoors or out

4-hour REI (Restricted Entry Interval) and 0-day PHI (Pre-Harvest Interval)

combined with increased perlite to provide excellent drainage

or a greenhouse grow setting

12_1/2x23_1/2x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack environmental-controllers The Original Can-Filters are designedNordic 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