8x28x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack spl_hgc Knockbox 3/100 Base

Knockbox 3/100 Base

Warranty ( Manufacturer ) 5 years

but more importantly

Nordic Pure 20x30x2 MERV 8 Plus Carbon air filters are made of a dual material where the MERV rated material has been fused together with a carbon layer

8x28x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack spl_hgc Knockbox 3/100 BaseNordic 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