8x8x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack 9 CFM a built-in self calibration function

a built-in self calibration function and an integrated photocell that enables operation in daytime hours only

Pumps up to 1200 gallons per hour and has a 17' shut-off

Speed is a huge factor in successful cloning because the faster a cutting roots

The Phantom is also the only ballast on the market designed for vertical or horizontal operation

Phosphorus is stabilized

8x8x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack 9 CFM a built-in self calibration functionNordic 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