PURPOSE: To extend or branch an air duct while running a fan. ;CONSTITUTION: Fasteners 10a, 20a, 21a are provided respectively at three directional openings 10, 20, 21 of a T-shaped air duct made of synthetic resin sheet to form a T-shape. Tubular bodies 11 are inserted in the inside of branch ducts 10b, 20b with openings respectively. One end of these tubular bodies 11 is airtightly stuck to the branches 10b, 20b and a closing means is provided at the other end.;COPYRIGHT: (C)1996,JPO
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