| 摘要 |
PROBLEM TO BE SOLVED: To improve quality, shorten a time of completion, and reduce a cost by a method wherein a hanging band is eliminated to save the labor for attaching the hanging band, hanging work at site is made easy, quick and correct, the damage of a duct is reduced, the waving state of the duct is eliminated, the interval of hanging support is widened and the use of hanging wires or the like is reduced. SOLUTION: A back fin 3, integrated with a heat resistant coating 2, is projected by a method wherein the upper parts of the heat resistant coating 2 are extended upward above the main body 1 of a heat resistant flexible duct, having the heat resistant coating 2 on the outer periphery of the same, to project belt type pieces 5, 6, raised up in parallel, while both of the belt type pieces 5, 6 are bonded mutually by heat resistant adhesive agent through a heat resistant belt type core material 7 between both of the belt type pieces 5, 6. The back fin 3 is provided with eyelets 8 with a predetermined interval. |
