| 摘要 |
A fan heater comprises a controller to switch the fan heater on or off, a passive infrared (PIR) detector 1 incorporated into a housing of the fan heater and being connected to the controller of the fan heater. The connecting of the PIR 1 and the fan heater controller may switch off the fan and or heating element when no movement and switch on the fan and or heating element when movement is detected by the PIR 1. A timer may be provided so that the fan and or heat element remains on for a period after the PR 1 detects movement. A thermostat and tilt switch may be provided. The speed of the fan and the heat output of the heating element may be adjustable. The PIR 1 is set to detect infrared from a human body and a sensor array of the PIR 1 may be covered by a focussing fresnel lens that detects movement between an arc of 30 to 120 degrees and up to a distance of five meters. The heating element may be ceramic heating elements or Positive Temperature Co-efficient (PTC) heating elements. A removable air filter and an electric ionizing element may be provided. The fan heater may operate in a heating or cooling mode by depressing a mode switch 5. An override switch 6 may be provided for continuous operation. |
