Ceiling mounted forced circulation electric air heater

Claim 1

A forced circulation air heater having an electric heating element, an electrically operated fan, and a housing for said fan and heating element, said housing comprising: an upper housing member, said upper housing member including a central disk portion, said disk portion terminating in an outwardly depending wall segment extending peripherally about said disk portion, said disk portion having formed integrally thereon and protruding axially downwardly therefrom a plurality of first convex dome-like bosses; a lower housing member, said lower housing member having a plurality of second convex dome-like bosses formed integrally thereon and protruding axially upwardly therefrom, said first and second bosses having substantially the same wall thickness, respectively, as said disk portion and said lower housing member respectively, said first and second bosses being positioned respectively to tangentially abut when said upper housing member is attached to said lower housing member at those points whereat said first and second bosses respectively abut; means to secure said first and second bosses together at said points; said upper housing member being shaped and dimensioned to overlap said lower housing member in spaced relation thereto, said upper and lower housing members thereby defining therebetween a peripherally extending passage whereby air may be directed therethrough by said electrically operated fan.