| 摘要 |
A ventilating assembly is formed of three basic modules, namely a base unit constituted as a static ventilator, a turbine unit constituted as a wind-operated ventilator, and a drive unit which can operate the turbine unit as a motor-driven ventilator. The base unit is affixed to the top of a chimney or a vent stack and can operate all alone as a static ventilator. The turbine can be attached to a seat on this base unit so that the turbine fan lies in a venturi chamber formed between upper and lower portions of the base unit. If desired the motor unit can further be mounted on top of the base unit and the motor output shaft connected to the turbine to drive same.
|
