| 摘要 |
An automatic air extractor (10) comprising an inverter frequency converter (14), with a PID (Proportional Integral Differential Acting) controller (15), configured to vary speed of an electric motor (11) driving a ventilator fan (13), in response to air quality condition monitored by a gas sensor (16) local to fan output, for prompt response to adverse environmental gas odour, such as smoke. Co-operative multiple fan operation is also envisaged, with optional control data link through a common mains supply interface. |
