8_1/2x30x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack Cone Filler this results in 40% greater

this results in 40% greater trichome preservation than the competition

The internal gears inside the locking ratchet are all built with stainless steel parts for a long-lasting smooth operation

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

BPA-free and environmental-friendly felt

8_1/2x30x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack Cone Filler this results in 40% greaterNordic 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