通风管道级电缆
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具有阻燃护套的电缆，获批在建筑物空气处理空间（通风管道）中安装。
建筑规范要求在吊顶上方的空气回流空间使用通风管道级（CMP）电缆，以防止火灾时产生有毒烟雾。通风管道级电缆成本比标准竖井（CMR）电缆高2-3倍，但在商业建筑中是强制性的。