21x27x1 Trane Replacement MERV 13 Plus Carbon AC Furnace Filters 6 Pack lighting-systems/kits These active ingredients are listed

These active ingredients are listed as food grade materials

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the duct fan can maintain airflow even in high static pressure applications

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21x27x1 Trane Replacement MERV 13 Plus Carbon AC Furnace Filters 6 Pack lighting-systems/kits These active ingredients are listedNordic Pure Trane Replacement 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