Patent ID: 11913460
Assignee: GREENHECK FAN CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. An exhaust fan assembly comprising:
a) an outer housing;
b) a fan housing mounted to the outer housing; and
c) a fan wheel and an electric motor operably coupled to the fan wheel, the fan wheel and electric motor being mounted within the fan housing;
d) wherein the fan housing defines an open inlet side for accepting airflow in a direction generally parallel to a rotational axis of the fan wheel and an outlet for discharging airflow in a direction generally perpendicular to the rotational axis, wherein the fan housing defines a volute section with two flat sides extending to an outer perimeter having a continuously curved cross-sectional shape in which a central portion of the outer perimeter is curved at a first radius and adjacent side portions of the outer perimeter are curved at a second radius being less than the first radius.