20x21_1/2x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack Lighting Accessories 6235A@AC120V 0

6235A@AC120V 0

GL240 & GL290)

Fill your container with potting soil and tamp down lightly to reduce total volume

Successful calibration indicator

It is held firmly in place using magnets

20x21_1/2x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack Lighting Accessories 6235A@AC120V 0Nordic Pure Custom MERV 12 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