| 摘要 |
PROBLEM TO BE SOLVED: To provide a piping type suction duct for quickly sucking a smoke or the like generated at a wide place thoroughly by piping of the suction duct for enhancing a suction effect, by using a plurality of fans and simultaneously sending and exhausting the smoke or the like to a predetermined place. SOLUTION: The suction duct (2) is connected between fans (1) and (1'). This constitution is sequentially extended, and the respective fans are simultaneously rotated.
|
