Unverified83% confidenceDecision RuleTime unknown
柜内实际可用宽度要减去两端安装占位：卡扣/法兰款每端占1.5-3cm，购买伸缩范围时应让柜宽落在伸缩区间中段，不要贴近最大值（拉满时管壁重叠最少最易弯）
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