④凈(jing)化(hua)通風(feng)(feng)管(guan)道(dao)及(ji)部(bu)(bu)件(jian)(jian)(jian)制(zhi)(zhi)作(zuo)與安裝，工程量計(ji)算方(fang)法(fa)與一般通風(feng)(feng)管(guan)道(dao)相同(tong)，用相應(ying)定(ding)額，但(dan)是，零部(bu)(bu)件(jian)(jian)(jian)安裝要計(ji)算凈(jing)化(hua)費，按相應(ying)部(bu)(bu)件(jian)(jian)(jian)子目安裝基價的(de)35%作(zuo)為(wei)凈(jing)化(hua)費。其中人工費占40%。對凈(jing)化(hua)管(guan)道(dao)與建筑物(wu)縫隙之間所做的(de)凈(jing)化(hua)密封處理，按實計(ji)算其費用。　　⑤塑料風(feng)(feng)管(guan)、管(guan)件(jian)(jian)(jian)制(zhi)(zhi)作(zuo)需熱煨成型，用木(mu)質胎具(ju)時(shi)(shi)，其胎具(ju)木(mu)材(cai)按一等方(fang)材(cai)計(ji)價攤銷。當(dang)風(feng)(feng)管(guan)工程量在30㎡以上時(shi)(shi)，攤銷0.06m3/10㎡;30㎡以下時(shi)(shi)，攤銷0.09m3/10㎡。　　⑥當(dang)風(feng)(feng)管(guan)、管(guan)件(jian)(jian)(jian)、部(bu)(bu)件(jian)(jian)(jian)、非(fei)標設備發生(sheng)(sheng)場外運輸時(shi)(shi)，廚房白鐵(tie)加(jia)工通風(feng)(feng)管(guan)道(dao)加(jia)工廠家，在場外生(sheng)(sheng)產的(de)施工組織設計(ji)必須經過審批，其運費按以下方(fang)法(fa)計(ji)算：　　運費=車(che)次數(shu)×車(che)核定(ding)噸位×噸千(qian)米(mi)單價×里(li)程　　車(che)次數(shu)=加(jia)工件(jian)(jian)(jian)總重量/車(che)次核定(ding)噸位×裝載(zai)(zai)系(xi)數(shu)　　裝載(zai)(zai)系(xi)數(shu)：非(fei)標準(zhun)設備及(ji)通風(feng)(feng)部(bu)(bu)件(jian)(jian)(jian)0.7;通風(feng)(feng)管(guan)及(ji)管(guan)件(jian)(jian)(jian)為(wei)0.5。不足一車(che)按一車(che)計(ji)。

工業(ye)通(tong)(tong)(tong)(tong)風(feng)(feng)(feng)管(guan)(guan)(guan)道(dao)設計過程中(zhong)，需(xu)考慮的(de)(de)(de)(de)主要因素有通(tong)(tong)(tong)(tong)風(feng)(feng)(feng)管(guan)(guan)(guan)道(dao)內(nei)空(kong)(kong)氣(qi)(qi)流(liu)(liu)(liu)動(dong)的(de)(de)(de)(de)阻(zu)力和通(tong)(tong)(tong)(tong)風(feng)(feng)(feng)管(guan)(guan)(guan)道(dao)內(nei)的(de)(de)(de)(de)壓力分布。通(tong)(tong)(tong)(tong)風(feng)(feng)(feng)管(guan)(guan)(guan)道(dao)內(nei)空(kong)(kong)氣(qi)(qi)流(liu)(liu)(liu)動(dong)的(de)(de)(de)(de)阻(zu)力有兩部分。一部分是(shi)(shi)由于空(kong)(kong)氣(qi)(qi)本身的(de)(de)(de)(de)粘(zhan)滯(zhi)性及與管(guan)(guan)(guan)壁之間(jian)(jian)的(de)(de)(de)(de)摩(mo)擦產生的(de)(de)(de)(de)能量(liang)損失(shi)，即摩(mo)擦阻(zu)力。另一部分是(shi)(shi)空(kong)(kong)氣(qi)(qi)流(liu)(liu)(liu)經(jing)通(tong)(tong)(tong)(tong)風(feng)(feng)(feng)管(guan)(guan)(guan)道(dao)中(zhong)的(de)(de)(de)(de)管(guan)(guan)(guan)件和設備時(shi)，廚(chu)房白(bai)鐵加(jia)工通(tong)(tong)(tong)(tong)風(feng)(feng)(feng)管(guan)(guan)(guan)道(dao)加(jia)工安裝，流(liu)(liu)(liu)速(su)的(de)(de)(de)(de)方(fang)向和大小的(de)(de)(de)(de)不(bu)斷變化與產生渦(wo)流(liu)(liu)(liu)造成相對比較集中(zhong)的(de)(de)(de)(de)能量(liang)損失(shi)，即局部阻(zu)力 。在工業(ye)通(tong)(tong)(tong)(tong)風(feng)(feng)(feng)系統中(zhong)，通(tong)(tong)(tong)(tong)風(feng)(feng)(feng)管(guan)(guan)(guan)道(dao)的(de)(de)(de)(de)摩(mo)擦阻(zu)力與空(kong)(kong)氣(qi)(qi)在通(tong)(tong)(tong)(tong)風(feng)(feng)(feng)管(guan)(guan)(guan)道(dao)內(nei)的(de)(de)(de)(de)流(liu)(liu)(liu)動(dong)狀(zhuang)態(tai)以及管(guan)(guan)(guan)壁的(de)(de)(de)(de)粗(cu)糙(cao)程度(du)有關。一般情況下，廚(chu)房白(bai)鐵加(jia)工通(tong)(tong)(tong)(tong)風(feng)(feng)(feng)管(guan)(guan)(guan)道(dao)，高速(su)風(feng)(feng)(feng)管(guan)(guan)(guan)的(de)(de)(de)(de)流(liu)(liu)(liu)動(dong)狀(zhuang)態(tai)處于過渡(du)區(qu)(qu)；薄鋼板的(de)(de)(de)(de)通(tong)(tong)(tong)(tong)風(feng)(feng)(feng)管(guan)(guan)(guan)道(dao)的(de)(de)(de)(de)空(kong)(kong)氣(qi)(qi)流(liu)(liu)(liu)動(dong)狀(zhuang)態(tai)多處在紊流(liu)(liu)(liu)光滑區(qu)(qu)和粗(cu)糙(cao)區(qu)(qu)之間(jian)(jian)的(de)(de)(de)(de)過渡(du)區(qu)(qu)；只有混凝土和磚(zhuan)的(de)(de)(de)(de)通(tong)(tong)(tong)(tong)風(feng)(feng)(feng)管(guan)(guan)(guan)道(dao)，在流(liu)(liu)(liu)速(su)很(hen)高時(shi)，空(kong)(kong)氣(qi)(qi)流(liu)(liu)(liu)動(dong)狀(zhuang)態(tai)才是(shi)(shi)粗(cu)糙(cao)區(qu)(qu)。

材(cai)(cai)(cai)質等級一般按用(yong)(yong)途區分：1、凈化空調系(xi)統(tong)用(yong)(yong)風(feng)管(guan)：鍍(du)(du)(du)鋅(xin)(xin)板(ban)、不(bu)(bu)銹鋼(gang)(gang)(gang)；（使用(yong)(yong)中可(ke)能出現塵源污染的玻(bo)璃(li)(li)鋼(gang)(gang)(gang)、復合材(cai)(cai)(cai)料(liao)(liao)禁(jin)(jin)用(yong)(yong)）2、中央(yang)空調系(xi)統(tong)用(yong)(yong)風(feng)管(guan)：鍍(du)(du)(du)鋅(xin)(xin)板(ban)、彩鋼(gang)(gang)(gang)保溫板(ban)；（可(ke)使用(yong)(yong)玻(bo)璃(li)(li)鋼(gang)(gang)(gang)、復合材(cai)(cai)(cai)料(liao)(liao)）3、環境控制系(xi)統(tong)用(yong)(yong)風(feng)管(guan)：鍍(du)(du)(du)鋅(xin)(xin)板(ban)、不(bu)(bu)銹鋼(gang)(gang)(gang)；（可(ke)使用(yong)(yong)塑(su)料(liao)(liao)、玻(bo)璃(li)(li)鋼(gang)(gang)(gang)、復合材(cai)(cai)(cai)料(liao)(liao)）4、工業通風(feng)系(xi)統(tong)用(yong)(yong)風(feng)管(guan)：鋼(gang)(gang)(gang)板(ban)、鍍(du)(du)(du)鋅(xin)(xin)板(ban)；（可(ke)使用(yong)(yong)塑(su)料(liao)(liao)、玻(bo)璃(li)(li)鋼(gang)(gang)(gang)、復合材(cai)(cai)(cai)料(liao)(liao)）注：玻(bo)璃(li)(li)鋼(gang)(gang)(gang)風(feng)管(guan)可(ke)分有(you)機(ji)、無(wu)機(ji)二種，根據設計規范有(you)消(xiao)防要求的禁(jin)(jin)用(yong)(yong)有(you)機(ji)材(cai)(cai)(cai)質；5、特(te)殊使用(yong)(yong)場合用(yong)(yong)風(feng)管(guan)：礦(kuang)用(yong)(yong)涂膠布(bu)風(feng)筒、礦(kuang)用(yong)(yong)塑(su)料(liao)(liao)通風(feng)管(guan)；（要求阻燃抗靜電礦(kuang)用(yong)(yong)安(an)全(quan)特(te)性）