12_1/2x23_1/2x1 MERV 7 Plus Carbon AC Furnace Filters 6 Pack PH/EC/TDS Meters and Solutions and are a USDA Certified

and are a USDA Certified Bio-Based Product

contaminant-free trimming environment

500 pack of large reusable

and an optimized light recipe

When full of water: 11

12_1/2x23_1/2x1 MERV 7 Plus Carbon AC Furnace Filters 6 Pack PH/EC/TDS Meters and Solutions and are a USDA CertifiedNordic Pure Custom MERV 7 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