25x28x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack 9 CFM then slowly increase concentration every

then slowly increase concentration every 2 weeks until you reach 25-30 ml/gallon

re-calibrate your meters periodically with a 20 ml pack of 1000ppm calibration solution

the Autopilot Cooling Thermostat will cut power to the cooling device

Par: 1980 µmol/s

complete with all 16 essential mineral elements

25x28x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack 9 CFM then slowly increase concentration everyNordic 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