排煙(yan)防火閥是一種(zhong)消(xiao)防部(bu)件,一般安裝在(zai)機械排煙(yan)系統的管(guan)道上,平(ping)時(shi)呈開(kai)啟狀態,發生火災時(shi)開(kai)啟排煙(yan),當排煙(yan)管(guan)道內煙(yan)氣溫(wen)度達(da)到(dao)280度時(shi)關閉,并(bing)在(zai)一定(ding)時(shi)間內滿足漏煙(yan)量(liang)和耐火完整性要(yao)求,起隔煙(yan)阻火作用。主(zhu)要(yao)材質:碳素鋼、鍍(du)鋅板、不銹鋼。