21x21x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack Aeromixer Synthetic Pro Edition • Increased weight capacity—roof cross-members

• Increased weight capacity—roof cross-members easily support 100 pounds

One DC power supply

Calibration with this meter is easy and completely automatic

aldehydes and terpenes

is compact/silent

21x21x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack Aeromixer Synthetic Pro Edition • Increased weight capacity—roof cross-membersNordic 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