HIGH-OUTPUT BLOWER Allegro Industries: 16 inches. Designed with rugged composite casing and precision balanced fan blades that straighten the airflow. Provides more power to the air with a 17-blade impeller. Two-hp motor offers 5,500 cfm from a 16-inch port. Glass-filled Lexan® polycarbonate case with internal stationary blades straightens the airstream, boosting output pressure. Built-in staking capability. Tel: (310) 633-4861.