Features:12" FlangeActivated Carbon Charcoal FilterMaintenance Free DesignSafe and Effective OperationCotton Filter PadPre-filter IncludedSpecification:Flange12"Optimal CFM1060Activated Carbon Weight68 lbsActivated Carbon NormCTC70Avg. Life Expectancy of Carbon1.5 yrsCarbon Layer Thickness72mmMaximum Temperature180 CelsiusPackage Content:1 x 12" Carbon Filter