8_1/2x30x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack Cone Filler Sleeves are designed with tunnelized

Sleeves are designed with tunnelized elastic to offer a more secure closure

Increase yields

Refill cartridge for Air Box 4+

BPA-free and environmental-friendly felt

these flood tables are built to last

8_1/2x30x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack Cone Filler Sleeves are designed with tunnelizedNordic 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