| 摘要 |
A duct for an air distribution system comprises a plurality of duct sections 1, 2 each comprising a hollow tubular element providing an air passage and having means to enable the plurality of duct sections to be joined together to form an air passage of desired length, wherein, prior to being joined together, each duct section is lined with an insulating lining material 8. The duct sections may be joined together by means of end flanges 5, 6 and a gasket 7 between the flanges. The insulating lining layer 8 of adjacent sections 1, 2 may abut to provide a continuous lining of the air passage or the ends 11 of the lining may be sealed with foil tape 12. The lining and/or the gasket may be formed of an expanded or foamed plastics material or a phenolic material and the insulating lining may be secured to the duct wall with a mastic adhesive 9. |
