| 摘要 |
A sliding sash window ventilator assembly for insertion between the window sashes and the window frame comprises an elongate ventilator housing having an air passage through and between its inner and outer lateral faces and an elongate facing member mounted by a parallel motion linkage onto said ventilator housing, such that lengthwise movement of said facing member produces movement of said facing member towards or away from said housing between a fully closed position obstructing said air passage and a fully open position.
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