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请协助翻译以下英文成中文

This category covers roof- and wall-mounted power ventilators and duct fans consisting of an impeller and motor installed in a housing. Roof- and wall-mounted power ventilators have a weather-resistant housing and are supported by a weather-resistant base intended to fit, by means of a curb, over a wall or roof opening.

This category covers roof- and wall-mounted power ventilators and duct fans consisting of an impeller and motor installed in a housing.  Roof- and wall-mounted power ventilators have a weather- resistant housing and are supported by a weather-resistant base intended to fit, by means of a curb, over a wall or roof opening.

机种包含由叶轮和马达组成装於一个外壳内的屋顶式及壁挂式电力通风机及管道鼓风机。 屋顶式和壁挂式电力通风机具有耐天候型的外壳并有耐天候型的基底用来以套挂方式装置於墙壁上或屋顶开口处。

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