Acme Miami 9014 14" 1290 CFM for Duct Booster - SilverFit all Ducts 6" and Up Metal - Fiberglass - Flexible. Install in Round, Square or Rectangular Duct. Heavy Duty Steel housings with solid seam construction. No Air Leaks! Motors have permanently lubricated bearings.Features of Acme Miami 9014 14" 1290 CFM for Duct Booster - Silver Acme Miami 901..