21x21x1 MERV 10 Plus Carbon AC Furnace Filters 6 Pack Electrical Components Big Foot Gold is second

Big Foot Gold is second to none

48 strips per case

Measures 51" L x 27" W x 13" H

Apply early morning or evening to avoid UV damage

21x21x1 MERV 10 Plus Carbon AC Furnace Filters 6 Pack Electrical Components Big Foot Gold is secondNordic Pure Custom MERV 10 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