| 摘要 |
PROBLEM TO BE SOLVED: To form a differential pressure type air feeding port, inserted into a wall hole for a living house, compactly so as to have fireproof function. SOLUTION: A differential pressure type air feeding port 1 is provided with an inserting unit 10 for inserting the same into a wall hole and a mounting unit 20 for attaching to the wall in a house. An air passage 11 for penetrating through the inside of the inserting unit 10 is formed so as to be divided into an upper air passage 11A and a lower air passage 11B while an upper opening and closing lid 12 and a lower opening and closing lid 13 are arranged openably for the upper air passage 11A and the lower air passage 11B. The mounting unit 20 is provided with a damper device 30 having a damper shaft 31, movable in up-and-down, an upper lid stopper 32 as well as a lower lid stopper 33, which are arranged at the upper and lower positions of the damper shaft 31, and a stop plate 34, supporting the damper shaft 31 at the elevated position and comprising a fuse 34c. In case of a fire, the fuse 34c is molten to drop the damper shaft 31 and, at the same time, the upper opening and closing lid 12 as well as the lower opening and closing lid 13 are closed by an upper lid stopper 32 and a lower lid stopper 33.
|
