Abstract: A rotating fan assembly is provided for use in single stage and multi-stage applications. The fan assembly includes a fan member having a tapered disk member, a flat annular ring member and a plurality of blade members interposed between the disk and the ring. The fan member may be housed in an enclosure shroud having a tapered case and a flat shell member thereby reducing case length from start of the shell to the inlet plane. The flat shell member doubles as a shroud for both the rotating fan member and for a stationary fan when used in multi-stage designs.

Abstract: In an electric motor fan unit, a motor section frame enclosing a motor ventilating fan moving air through an internal motor cooling air path includes an end bracket with an enlarged rim for mounting fan shell and interior partition structures defining a fan section housing with a chamber for a working air centrifugal impeller mounted on the motor shaft outboard of the end bracket and drawing a working air stream into a housing axial inlet for discharge at the housing circumference, and with an inner chamber for a slinger disk on the shaft to afford bearing protection from working air borne moisture, contaminants, and high temperature and humidity, by simple, low cost, durable structure.