Additional supply duct section. Supply or return duct can be specified. Single - or double-line ducts can be specified.
附加送风管道部分。可指定送风管道或回风管道。可以指定单线管道或双线管道。
Duct extension. Supply or return duct can be specified. Single - or double-line ducts can be specified.
管道延伸。可指定送风管道或回风管道。可以指定单线管道或双线管道。
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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