| 摘要 |
The apparatus comprises a sensing means for detecting the position of a door or window in a building and a controller for regulating air leakage in an escape route of the building based upon the detected position of the door or window. The sensing means may detect the angular or linear displacement of a door or window relative to its frame. The sensing means may comprise an optical sensor having a light emitter arranged to emit visible, infra-red or laser light towards the door and a light detector to receive the light reflected back from the door. The sensing means may comprise a potentiometer, Gill Blade sensor, Magnetopot sensor, Softpot sensor or rotary encoder. The apparatus may control air pressure within the escape route using one or more ventilation fans so as to inhibit the entry of smoke into the escape route during a fire. The escape route may be a stairwell, lobby, corridor or fire fighting stairway. The apparatus may be arranged to control the velocity of escaping gas, air or smoke across the face of a door in a burning building so that it is at least 2 ms-1 on fire doors and ground floor doors. |
