Unverified85% confidenceSolutionTime unknown
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
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85%
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Long-term
Relevance
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Unverified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84% similarUnverified弹力免打孔窗帘杆（顶伸式）适合窗框内侧安装，两端顶在墙面凹槽内，承重通常仅3-8kg，只能挂轻薄纱帘或半帘84% similarUnverified安装方式权衡：入墙内嵌（窗洞内固定）美观贴窗但需窗洞深度≥6cm且遮光边缘缝隙大；墙面外挂（顶装/侧装）遮光更好、适配任意窗洞但会凸出占空间，纱窗侧建议外挂避免与纱窗冲突81% similarUnverified贴框免打孔安装依赖窗框内侧平整度和深度，窗框过浅或有凸起结构可能无法贴合，购买前需测量窗框内径深度81% similarUnverified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80% similar
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