| 摘要 |
PROBLEM TO BE SOLVED: To solve problems wherein, in the case of flooding below or above floor level by heavy rain, high tide water or the like, a conventional under-floor ventilating fan is unusable by immersion of an electric circuit in salt water, sludge, etc., and under-floor soil becomes more easily wettable by intrusion of sludge involving water and bad smell under a floor, which are caused by that a ventilation device is set under the floor, and a ventilation hole or the like is not designed. SOLUTION: To prevent sinking of the ventilation device in water, a storage box therefor is constructed on a tower, or the storage box is erected under an eaves, a roof or the like, and in case of flooding, this is sensed by a float to stop useless operation of the ventilating fan and to close the ventilation hole. According to this, immersion of both the ventilating fan and the under-floor space can be prevented, and the under-floor space can be ventilated simultaneously with receding of the water. Optionally, ventilation of an under-roof space and a room can be performed. COPYRIGHT: (C)2006,JPO&NCIPI
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