Abstract: Disclosed is a blower assembly for use in dispersing heat from an image projector with minimum air flow noise by interposing a constant torque clutch formed of a dual wound spring between the blower and a motor output drive to permit the rate of rotation of the blower to vary in response to variations in air weight due to changes in temperature, atmospheric pressure, and moisture content.

Abstract: A film handling apparatus blower system. The system includes a blower having a high-pressure, low-volume section and low-pressure, high-volume section. The high-pressure, low-volume section is a scroll-type centrifugal blower with a circular impeller of cellular material to minimize discernible noise, an axial intake port, and a high-pressure outlet port. The high-pressure outlet port is coupled to a duct which directs the output high-pressure air flow into a film cassette. The low-pressure, high volume section is also a scroll-type centrifugal blower having a bladed fan wheel, an axial intake port, and three low-pressure outlet ports. One low-pressure outlet port is coupled to a duct which directs output air flow to a location for flow adjacent the rearward portion of a projection lamp. A second low-pressure outlet port is coupled to a duct which directs output air flow to a location for flow adjacent the frontal portion of the projection lamp.