| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a fireproof or fire-retardant duct without the problems of a conventional fireproof duct used in homes and buildings having a metal pipe surrounded by nonorganic fibers represented by glass fibers covered by a heat insulating material, which is heavy and has problems in workability and pressure loss. <P>SOLUTION: In a flexible duct for air conditioning that is fireproof or fire-retardant having an inner pipe including a wall-thickness part made of a non-woven fabric and a ring-like or spiral core material made of a thermoplastic hard resin, a heat insulating layer laminated thereon, and an airtight layer laminated further thereon, a resin foamed layer subjected to a fire-retardant treatment as the heat insulating layer, or a thermoplastic fiber layer subjected to a fire-retardant treatment is used. <P>COPYRIGHT: (C)2009,JPO&INPIT |
