The 4-inch DuraBreeze® Carbon Filter keeps indoor garden air clean and fresh. This filter contains a 2.5-inch pelletized carbon bed within zinc-anodized steel housing. It includes a pre-filter, attached flange and a one-year warranty, and has an approximate life span of one year. Effective up to 300 cubic feet per minute with a diameter of 9.5 inches and a height of 12.5 inches including the flange. Weighs approximately 17 pounds.