9x27x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack hydro-systems For new plantings and container

For new plantings and container plants

Length: 25'

8% Urea Nitrogen

Records high and low CO2 levels

water repellent protection

9x27x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack hydro-systems For new plantings and containerNordic 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