Version supported on strong rectangular side frames, made of hot rolled steel sections, fixed on the scroll sides with screws, available from the size 315 up to the size 1000.  Ball bearings with conical sleeve on single-piece cast iron pillow blocks with grease points.
The standard fan can be freely rotated, to allow installation with orientation 0°, 90°, 180° or 270°, as defined in ISO 13349.
