| 摘要 |
A ventilation system having a cylindrical reducer, a pair of adjustable structural supports and a ceiling electrical box concentrically mounted to the structural supports. The electrical box is configured to support the weight of a ceiling fan assembly. The pair of adjustable structural supports include a first member and a second member that pass through the reducer. The members are hollow so that a first slidable strut extends from within a first end of the first member to a desired length and the second slidable strut extends from within an opposing second end of the first member to a desired length. Similarly, second member is hollow so that a third slidable strut extends from within a first end of second member to a desired length and fourth slidable strut extends from within an opposing second end of second member to a desired length.
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