17x29x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack Grow Strong Without proper enzymatic activity

Without proper enzymatic activity

alkaline buffer raises water and nutrient solution pH

the duct fan uses a mixed flow design using a stator blade and dual hydrodynamic wind circles

Max Fluid Temperature: 95 ℉

• Approved under Washington State Department of Agriculture Organic Food Program for use in organic production

17x29x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack Grow Strong Without proper enzymatic activityNordic 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