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style="font-size:14px;">(1)選定的板才表面應光潔整平.薄厚勻稱，鐵皮通風管道并不可存有裂紋.沙孔.結痂及刺邊和生銹的情形存有。</span><br /> <span style="font-size:14px;">(2)有關槽鋼其應等型.勻稱，不應該有裂紋.汽泡.窩穴及其別的會影響到產品質量的缺點。</span><br /> <span style="font-size:14px;">(3)選定的其它原材料，也無法因具備缺點，造成產品抗壓強度的減少或危害其采用的效率。</span><br /> <p> <span style="font-size:14px;">2.有關風管和零配件，鍍鋅風管加工表面應整平.弧形勻稱.豎向拼縫應分開。同階段咬口縫也須要密切，總寬勻稱。焊接則應要外型的查驗，不應該有出氣孔.沙孔.焊瘤.裂紋等問題存有。</span> </p> <p> <span style="font-size:14px;">3.有關制做金屬材料風管和零配件，其直徑或外面長短能夠容許的誤差為：廚房排風管道小于或等于300㎜為-1㎜，超過300㎜為-2㎜，在其中環形法蘭內徑或矩形框法蘭內邊的規格，能夠容許誤差為+2㎜，不平度市不可超過2㎜。</span><span style="font-size:14px;"></span> </p></div> </td> </tr> </table> </p> </div> </div>  <div class="bto"></div> </div> </div> </div> </div> ?<div data-sgpg="sgpg" class="foot_w"> <div class="colsg_inner"> <div class="droppable clearfix"></div> </div> </div> <div data-sgpg="sgpg" class="foot_a"> <div class="colsg_inner"> <div style="width: 575px;" class="droppable sgcol_3 fl"> <div class="model custom_html_model" data-global="0" 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