21x23_1/2x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack soil DLC Certified: Download the certification

DLC Certified: Download the certification here

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This rugged and reliable vacuum pump is designed for long life with continuous use

Use with Athena Pro Core for a complete and balanced recipe

21x23_1/2x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack soil DLC Certified: Download the certificationNordic 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