21_1/4x21_1/4x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack Tents & Tarps Saves CO2 and prevents odors

Saves CO2 and prevents odors from flowing backwards

Tracking grain depression is required for insurance purposes

These leading-edge blocks have the optimal fibre structure and physical properties for crop uniformity

The machine breaks-down by hand with no tools other than our handy Spring Jack

21_1/4x21_1/4x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack Tents & Tarps Saves CO2 and prevents odorsNordic 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