Lobed joint draft inducer blower

A blower housing defining perpendicular axial and radial directions, comprising:

• a first housing member including a substantially cylindrical outer wall and a circular outlet projecting in the radial direction from said outer wall;
• a second housing member including a substantially circular base wall;
• an exhaust transition extending toward said outlet, said exhaust transition defined by said first and second housing members;
• and
• a first joint line between said first and second housing members, said first joint line extending along said exhaust transition and sloping in the axial direction toward said outlet.

A blower housing defining perpendicular axial and radial directions, comprising:

• first and second housing members connected to one another to define a circular main cavity therebetween;
• a plurality of mounting lugs disposed in spaced relation around an outer periphery of said blower housing;
• a circular outlet projecting in the radial direction from said blower housing, said outlet formed by at least one of said first and second housing members;
• an exhaust transition extending from said main cavity toward said outlet, said exhaust transition defined by said first and second housing members;
• and
• each of said first and second housing members including smoothly contoured interior surfaces extending along said exhaust transition from said main cavity toward said outlet.

A blower housing defining perpendicular axial and radial directions, comprising:

• first and second housing members connected to one another to define a substantially circular main cavity therebetween;
• a plurality of mounting lugs disposed in spaced relation around an outer periphery of said blower housing;
• a circular outlet projecting substantially in the radial direction from said blower housing, said outlet formed by at least one of said first and second housing members;
• an exhaust transition extending from said main cavity toward said outlet and including smoothly contoured interior surfaces extending from said main cavity to said outlet.