14x22x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack -monitors-&-timers There are no flat surfaces

There are no flat surfaces due to the inward and outward pointed cones

as well as many soil-dwelling pests

depending on the type of plants you are growing and the quantity of plants in your system

*PLEASE NOTE: This item is for drop ship only

14x22x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack -monitors-&-timers There are no flat surfacesNordic 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