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跨度超过1.8米时不要用单根免打孔伸缩杆挂帘，中段必然下垂或整体脱落，应改为打孔窗帘杆或在中间增设支撑架

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Unverified免打孔杆整体承重上限普遍不超过8-10kg，若窗帘宽度超过2米需分段挂或用多个粘贴支座分担，单杆跨度过大中间会下垂86% similar Unverified浴帘杆跨度超过1.2m时免打孔伸缩杆易中间下垂脱落，跨度>1.5m建议直接选墙面固定式帘杆86% similar Unverified选购前先量窗洞内深：顶住式杆需要窗洞内两侧有>3cm平整接触面才能顶稳；若窗户齐平墙面无凹陷，只能选侧装外露支架而非伸缩杆84% similar Unverified伸缩杆长度选择应使窗洞宽度落在杆可调范围的中段（约60-70%位置），不要接近最大拉伸极限；拉到接近极限时管壁咬合变短，承重和稳定性骤降84% similar Unverified免打孔伸缩杆承重有限（一般≤5kg），不建议用于加厚遮光布或大窗，重帘会导致杆子下垂脱落83% similar

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