11_1/2x11_1/2x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Air Purification At the heart of this

At the heart of this system is the PHB5020 Phantom Commercial DE Ballast with USB Interface

ergonomically designed display

and will notify you when service is required

reliability

11_1/2x11_1/2x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Air Purification At the heart of thisNordic 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