20x21_1/2x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack Water Pumps & Irrigation Supplies The built-in temperature sensor ensures

The built-in temperature sensor ensures every reading is adjusted for environmental changes

first extraction

Efficient integrated flange for 8" ducting

• Contains beneficial photosynthetic microorganisms

20x21_1/2x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack Water Pumps & Irrigation Supplies The built-in temperature sensor ensuresNordic 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