30x30x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack environmental-controllers • Measures conductivity EC

• Measures conductivity EC

Pure contains a combination of highly active organic acids including humic acid

• Targets both pests and mold

The Hydrofarm Vertical Grow Shelf System is a sturdy

30x30x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack environmental-controllers • Measures conductivity ECNordic 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