The 1300 Max Cfm Blower Ensures The Wtd9M Series And Cpd9M Series Outdoor Range Hoods Will Handle The Heat & Smoke Created By Outdoor Grills. (Ul)(Li)10-Inch Duct Size To Handle Output(/Li)(Li)11.0 Sones On High Cfm(/Li)(Li)For Use With Wtd9M And Cpd9M(/Li)(Li)Thermal Overload Protected(/Li)(Li)Doesn’T Includes Rough-In Kit With 10-In. Round Inline Damper(/Li)(/Ul)