中文字幕有码在线视频|最新国产成年人小视频|亚洲中文字幕无码手机版|国产精品无码av不卡顿|国产自产精品爆乳一区二区|精品三级无码视频在线观看|久久精品国产精品亚洲艾草网|91亚洲成a人片在线观看无码

　　用于消防排煙系統(tǒng)中，當(dāng)有火警發(fā)生時可通過該按鈕來緊急開窗排煙。緊急按鈕線路在遇到開路或者短路故障，排煙窗會立即自動開啟，保障了消防排煙窗系統(tǒng)的可靠性。

Used insmoke exhaust system, to open window and exhaust smoke by manual emergencybutton when firing, smoking window will open automatically when there is somewrong with open circuit or short circuit of emergency button line, Guaranteethe high performance of smoke exhaust system.