镀锌钢板风管(角铁法兰)主辅材计算 镀锌钢板 - 角铁法兰风管损耗13.8% - 风管法兰翻边余量6~9mm - 风管封头面积 S=L * W - 静压箱面积 S=(L*W+L*H+W*H)*2
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镀锌钢板风管(角铁法兰)主辅材计算 镀锌钢板 - 角铁法兰风管损耗13.8% - 风管法兰翻边余量6~9mm - 风管封头面积 S=L * W - 静压箱面积 S=(L*W+L*H+W*H)*2
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