| 摘要 |
A duct member for housing a damper, comprising a tubular wall defining a passageway between an upstream end portion and a downstream end portion of the tubular wall; an opening in said tubular wall, adapted to allow access for operatively positioning a damper within said passageway, and a detachable closure, adapted to close said opening, and further adapted to sealingly engage a damper within said passageway. |
