20x21_1/2x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack grow-light-ballasts Temperature chart of the actual

Temperature chart of the actual µS/cm value at various temperatures printed on each bottle

Cereal Grains

They are very safe and easy to operate

15" wide x 18" high

20x21_1/2x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack grow-light-ballasts Temperature chart of the actualNordic Pure Custom MERV 8 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