13x21_3/4x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack pots the CenturionPro® Silver Bullet does

the CenturionPro® Silver Bullet does the work of up to 60 human workers without sacrificing quality

and the planet

Coloration ranges from beige to amber/red depending on prey consumed

NOTE: Not compatible with Phantom and Xtrasun ballasts

13x21_3/4x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack pots the CenturionPro® Silver Bullet doesNordic Pure Custom MERV 7 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