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After years of research and field experimentation
always insert MacroPlugs in a tray with individual cells
000-hour rated life
which simplifies cleaning
bigger plants
21x23_1/4x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack Travel Bags & Backpacks After years of research andNordic 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
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