Smoke exhauster having an improved fan device

摘要

A smoke exhauster includes a motor and a fan device attached to a housing. The fan device includes an upper and a lower plates each having an outer peripheral portion, and a number of fan blades secured between the outer peripheral portions of the upper and the lower plates for forming a chamber in the fan device. The lower plate has a bore for air to flow or to be drawn into the chamber of the fan device. The fan blades each has an inner section partially extended inward of the bore of the lower plate and has a curvature smaller than the other portion of the blade.