| 摘要 |
PURPOSE:To enable the number of component elements to be reduced and provide a weather cover the cost of which can be saved by a method wherein both first and second dampers are pivotally arranged at a main body of cover acting as a hood, a thermal melting member is arranged to hold both dampers always at positions where an interior of the main body of the cover is partitioned into a discharging passage and a sucking passage, and a spring is provided to cause both dampers to be biased in such a direction as to close each of the discharging passage and the sucking passage. CONSTITUTION:A discharging port fire-proof damper 21 and a sucking port fire-proof damper 22 positioned oppositely are held with a temperature fuse 24 at positions where an interior of a main body 18 of a cover is partitioned into a discharging passage 26 and a sucking passage 27. A fire is generated within a room, a temperature of a weather cover 17 is increased, and a temperature fuse 24 is blown. Each of the discharging port fire-proof damper 21 and the sucking port fire-proof damper 22 is biased in a direction of arrow A and a direction of arrow B, respectively and rotated to close a discharging port 19a and a sucking port 19b of the fixing plate 19. As a result, the discharging passage 26 and the sucking passage 27 are closed to prevent spread of fire. Since the damper 21 and the sucking port fire-proof damper 22 act as a partition member to provide the discharging passage 26 and the sucking passage 27, the partition member can be eliminated and its cost can be saved. |
