安(an)(an)裝于機械排煙(yan)(yan)系統(tong)各支管端部(bu)（煙(yan)(yan)氣吸入口）處起排出(chu)煙(yan)(yan)氣的作用。平(ping)時常閉，火災或(huo)需(xu)要排煙(yan)(yan)時。手動或(huo)電(dian)動打開。并輸出(chu)電(dian)信(xin)號，安(an)(an)裝方式(shi)分為雙法(fa)蘭安(an)(an)裝式(shi)、單法(fa)蘭安(an)(an)裝式(shi)和墻裝式(shi)三種。
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