Best? Internal Blowers Provide The High Ventilation And Durable Construction To Meet The Needs Of Professional-Style Cooking Appliances For The Home. (Ul)(Li)The Pf6 Flexblower Is Designed For Use With The Best Downdraft(/Li)(Li)Quiet And Efficient 650 Max Cfm Blower Operates At 8.9 Sones When Installed(/Li)(Li)Permanently Lubricated, Thermally-Protected Motor(/Li)(Li)Neoprene, Resilient Anti-Vibration Mounts(/Li)(Li)Can Be Mounted Directly To Downdraft Or Mounted Remotely(/Li)(Li)Uses Standard 8" Round Duct(/Li)(Li)Can Be Rotated Or Mounted To Downdraft In 3" Increments From Airbox Centerline(/Li)(Li)Rough-In Kits Are Included To Make The Installation Clean And Simple(/Li)(/Ul)