12_1/8x15x1 MERV 7 Plus Carbon AC Furnace Filters 6 Pack DUCTWORK Duct Opening Diameter: 4 inches

Duct Opening Diameter: 4 inches | Front Plate Size: 6

display lock or off while programs are running

Monitor EC regularly and adjust accordingly based on the crop and growth stage

The natural fungal spores in RootWeb bond to the root system of most plants

Precisely control photon output when paired with Autopilot PX series controller (PX2 and above)

12_1/8x15x1 MERV 7 Plus Carbon AC Furnace Filters 6 Pack DUCTWORK Duct Opening Diameter: 4 inchesNordic 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