Blowers feature nonoverloading, dynamically balanced wheels that provide full Class 1 performance range; CW rotation. Welded steel housing with weatherproof drive cover and 8-position discharge. Pillow-block bearings . Gray baked-on epoxy finish. Features fixed-sheave drive.Note: Review OSHA Codes. OSHA complying guards are required when fan blades are exposed and within reach of personnel. The A weighted sound ratings shown have been calculated per AMCA Standard 301. Values shown for blowers are for (inlet Lwi) sound levels for: Installation Type B: free inlet, ducted outlet. Ratings do not include the effects of duct end correction.