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A pre-filter is the first line of defense against dust and debris clogging the pores of the carbon in your filter
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17_1/8x34_7/8x1 MERV 14 Plus Carbon AC Furnace Filters 6 Pack PPE A pre-filter is the firstNordic Pure Custom MERV 14 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
