Hollow draft inducers (draft inducers or hollow inducers)

A hollow draft inducer having an inlet and an outlet adapted for connecting to a flue stack, comprising:

• an upper cylindrical casing;
• a lower cylindrical casing;
• an impeller cylindrical casing, wherein each of the upper, lower and impeller cylindrical casings are formed of a refractive material;
• the upper cylindrical casing having the outlet with a female connection and a first top bearing cover;
• the upper cylindrical casing including an anchoring for an external motor with a drive shaft having a drive gear, the drive gear communicating with an impeller gear connected to an outside perimeter surface of the impeller cylindrical casing;
• an inner circumference surface of the impeller cylindrical casing having a plurality of impeller elements arranged around an inside perimeter of the inner circumference surface;
• wherein the impeller cylindrical casing is rotatably mounted between the upper and lower cylindrical casings and is driven by the drive shaft of the external motor;
• the impeller cylindrical casing having a first lower bearing cover with ball bearings in communication with the first to bearing cover of the upper cylindrical casing, and the impeller cylindrical casing having a second to bearing cover in communication with ball bearings in a second lower bearing cover of the lower cylindrical casing;
• the lower cylindrical casing having the inlet with a male connection and the second lower bearing cover with ball bearings in communication with the second to bearing cover of the impeller cylindrical casing.