防排烟镀锌钢板是免检产品吗？ 防排烟风管是用镀锌钢板，还是用镀锌铁皮；有没有相关规范标准？...
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产品免检是指符合规定条件的产品。防排烟矩形风管(镀锌钢板)必须满足 《通风与空调工程施工质量验收规范》GB50243-2016规范要求。
防排烟镀锌钢板是否是不是免检产品？这种会是一段时间之后就会坏掉了。
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