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• End of lamp life signal
causing them to cluster together and either fall out of the air or be captured by filters — effectively neutralizing them without chemicals or ozone
no wasted substrate
dehumidifier or fan
With its deliberate blend of distinct ingredients
20x21_1/2x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack Master Controller • End of lamp lifeNordic 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