Motor-fan assembly having a tapered stationary fan with a concave underside

A motor-fan unit comprising:

• an end plate assembly;
• a motor assembly supported by said end plate assembly;
• a shaft rotated by said motor assembly and extending through said end plate assembly;
• and
• a fan assembly supported by said end plate assembly, said fan assembly comprising:
• a discharge shell attached to said end plate assembly, said discharge shell having a circular wall with a rim;
• a tapered fan secured to said rotatable shaft;
• a tapered fan shell that includes an outer edge having a U-shaped ridge and a ledge extending from said U-shaped ridge, said U-shaped ridge forming a groove;
• a stationary fan having a fan side and a shell side, said stationary fan having an outer periphery with a downwardly extending nub and a radially extending lip;
• and
• a rotating fan secured to said rotatable shaft;
• wherein said tapered fan shell is interposed between said rim and stationary fan such that said U-shaped ridge is received within said circular wall and said nub fits in said groove.