Phat Filter, 12" x 39", 1700 CFMGet rid of the nastiest odors from your grow area or greenhouse using Phat Filter. It is loaded with the best carbon on the market virgin activated Australian granular carbon. It absorbs unwanted dirt, dust, and other harmful pollutants. You can mount the Phat filter to a wall, ceiling or place it on the floor depending on your needs. Outer Aluminium Mesh: It comes with an outer aluminum mesh that offers 53% open area for better airflow. Superior