| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive draft chamber device that always maintains a constant surface speed in an opening surface, causes no backflow of toxic vapor, and is easily adapted even to preinstalled equipment. SOLUTION: This draft chamber device exhausts an atmosphere in a casing 1 outdoors via an exhaust pipe 2 by arranging an indoor side front door being a partition with the inside of a room in an opening part arranged in the casing 1 having the exhaust pipe 2. The indoor side front door is composed of respectively one or more of main doors 3a and auxiliary doors 3b, and maintains an exhaust surface speed of the opening surface constant by keeping the opening surface area formed by opening an interval between the main doors 3a and the auxiliary doors 3b constant. A hook 8 is respectively arranged on the main doors 3a and the auxiliary doors 3b, and can be fixed by changing the interval between the main doors 3a and the auxiliary doors 3b by a connecting plate 7 having a positioning hole 9 connected to this hook 8. The main doors 3a and the auxiliary doors 3b can integrally move by connecting the main doors 3a, the auxiliary doors 3b, and the connecting plate 7. COPYRIGHT: (C)2004,JPO
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