一、制作方法：

　　接直徑(jing)大(da)小、節(jie)數、曲率(lv)半徑(jing)這(zhe)些數據進(jin)行(xing)每節(jie)展開，然(ran)后腹板相對再焊起來

　　二、通(tong)風管(guan)的簡單介紹:

　　通(tong)(tong)風(feng)(feng)(feng)(feng)管(guan)(guan)是中空的(de)(de)用(yong)于通(tong)(tong)風(feng)(feng)(feng)(feng)的(de)(de)管(guan)(guan)材(cai)(cai)風(feng)(feng)(feng)(feng)管(guan)(guan)彎頭，多為圓形或方形。通(tong)(tong)風(feng)(feng)(feng)(feng)管(guan)(guan)制作與安裝所用(yong)板材(cai)(cai)、型(xing)材(cai)(cai)以及其它主要(yao)成品材(cai)(cai)料，應(ying)(ying)符合設(she)計及相關產品國(guo)家(jia)現行標準的(de)(de)規定，并(bing)應(ying)(ying)用(yong)出廠檢驗(yan)合格證明，材(cai)(cai)料進場時(shi)應(ying)(ying)按國(guo)家(jia)現行有關標準進行驗(yan)收(shou)。通(tong)(tong)風(feng)(feng)(feng)(feng)管(guan)(guan)一(yi)般有：船用(yong)通(tong)(tong)風(feng)(feng)(feng)(feng)管(guan)(guan)有正壓通(tong)(tong)風(feng)(feng)(feng)(feng)管(guan)(guan)和負壓通(tong)(tong)風(feng)(feng)(feng)(feng)管(guan)(guan)及PE薄膜通(tong)(tong)風(feng)(feng)(feng)(feng)管(guan)(guan)。

　　環保通風工程通風管、鍍鋅板（白鐵）風管、不銹鋼通風管、玻璃鋼通風管、塑料通風管、復合材料通風管、彩鋼夾心保溫板通風管、涂膠布通風管（如礦用風筒）、礦用塑料通風管等；伸縮通風管，阻燃風管， 鋁箔復合保溫管；中央空調保溫軟管。