Supply or return duct section. Single - or double-line ducts can be specified.

送风或回风管道部分。可以指定单线管道或双线管道。

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Return air duct section. Single - or double-line ducts can be specified.

回风管道部分。可以指定单线管道或双线管道。

youdao

Return air duct section. Single - or double-line ducts can be specified.

回风管道部分。可以指定单线管道或双线管道。

youdao