Patent ID: 6945753

Claim:
A smoke exhauster comprising: a housing, a motor attached to said housing, and a fan device attached to said motor and to be driven by said motor, said fan device including: an upper plate, a lower plate having a bore formed therein, and a plurality of fan blades secured between said upper plate and said lower plate, to define a chamber between said upper plate and said lower plate of said fan device, said chamber of said fan device being communicating with said bore of said lower plate to allow air to flow into said chamber of said fan device, and each of said fan blades including a lower cut-off portion formed therein to allow the air to flow deeper into said chamber of said fan device before contacting with said fan blades, and each of said fan blades including an inner segment, an intermediate segment, and an outer segment, said outer segment of said fan blade including a width no greater than that of said lower plate of said fan device.