11_1/2x11_1/2x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack water-filtration Engine RPM Range: 1800 –

Engine RPM Range: 1800 – 2000 RPM

• Made in the USA

Gun Safes: Prevent rust to guns and expensive ammunition and other damage caused by excess moisture

• 85% Noise Reduction Coefficient (NRC)—best on the market

11_1/2x11_1/2x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack water-filtration Engine RPM Range: 1800 –Nordic Pure Custom MERV 13 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