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用途：風(fēng)管止回閥安裝在通風(fēng)或空調(diào)管道中，風(fēng)機(jī)運轉(zhuǎn)時閥門開啟，氣流順利流過
風(fēng)機(jī)停轉(zhuǎn)時閥門關(guān)閉，防止氣體倒流
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