| 摘要 |
PROBLEM TO BE SOLVED: To improve the heat insulation of a connection between a branch duct and a main duct in a flexible duct.SOLUTION: A peripheral side part of a main duct 10 and a base end part of a branch duct 20 in a flexible duct 1 are connected by duct connection means 30. The duct connection means 30 has an annular connection heat insulation layer 33 along the circumferential direction of the base end part of the branch duct 20. The connection heat insulation layer 33 comprises a polyolefin resin foam.SELECTED DRAWING: Figure 2 |
