13x21_3/4x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Hydro Systems 4 Liters (1

4 Liters (1

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Many years were spent developing a blend of Ona and various suspension elements to result in a product that has excellent dispersion qualities

13x21_3/4x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Hydro Systems 4 Liters (1Nordic Pure Custom MERV 13 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