Fan blower assembly with one-piece air diffuser and bayonet-style end cap

A blower assembly, comprising:

• a rotor assembly having a shaft;
• a stator assembly coupled to said rotor assembly;
• a shrouded fan assembly coupled to said shaft so as to generate an air flow when said shaft rotates;
• a unitary diffuser having a fan side opposite a motor side, said fan side coupled to said shrouded fan assembly, said unitary diffuser having ports for transferring the air flow from said fan side to said motor side, said motor side having a stator wall that partially encloses said stator assembly and said rotor assembly, wherein said motor side has a plurality of curvilinear vanes extending between said ports and said stator wall;
• an end cap coupled to and position within the said stator wall for further enclosing said stator assembly and said rotor assembly;
• and
• a cover having an outlet, wherein said cover is secured to said motor side of said unitary diffuser.

A diffuser for a blower assembly, wherein the diffuser carries a motor assembly and a shrouded fan assembly, the motor assembly having a shaft that rotates a fan in the shrouded fan assembly, the diffuser comprising:

• a plate having a fan side opposite a motor side and a shaft hole therethrough, said plate having a plurality of ports extending therethrough;
• a stator wall extending from said motor side, said stator wall partially enclosing the motor assembly;
• and
• an end cap coupled to said stator wall for further enclosing the motor assembly, wherein said end cap has at least one tab and wherein said stator wall has at least one tab receptacle, said at least one tab receivable in said at least one tab receptacle to releasably secure said end cap to said stator wall.