| 摘要 |
A collar [1, 100, 200, 300] for connecting a duct to a wall [15] having a hole [51] therein bounded by an edge having a predetermined thickness. The collar [1, 100, 200, 300] is constructed from a sheet of material having top, bottom, left and right edges, the sheet forming a tubular structure in which the left and right edges overlap. The sheet includes a groove [10] for engaging the edge of the hole [51]. The sheet also includes first and second detents [3, 4] spaced apart thereon. The overlap of the left and right edges at the top edge changes when the spacing between the first and second detents [3, 4] is changed. The collar [1, 100, 200, 300] also includes a first fastener [6] for fixing the overlap of the left and right edges at the top edge when the edge of the hole [51] is engaged in the groove [10] and a second fastener [2] for fixing the overlap of the left and right edges at the bottom edge. In the preferred embodiment of the present invention, the groove [10] includes a layer of a sealing material [11, 303] for forming a seal between the sheet of material and the edge of the hole [51]. The collar [1, 100, 200, 300] is shipped with a removable cover strip [16] over the groove [10] for protecting the layer of sealing material [11, 303]. A ridge [13] for forming a seal with the duct when the duct is installed over the collar [1, 100, 200, 300] may also be included in the sheet. |
