Unverified84% confidenceDecision RuleTime unknown
买杆长度须按窗框左右各外延15-20cm计算总长（而非仅窗宽），遮光帘拉开时能完全避开窗户并减少侧漏光；伸缩杆购买要预留20%收缩余量避免顶到极限
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Unverified选购前测量窗宽后应按窗宽×1.05再加两侧各15-20cm延伸量确定杆/轨长度，遮光帘需超出窗洞两侧使闭合时侧边不漏光；伸缩杆要选实际可调范围覆盖目标长度且预留≥10cm余量，避免拉到极限承重下降90% similarUnverified飘窗和落地窗不建议用短帘，遮光帘长度需超窗台15-20cm或落地拖地2-3cm，短于窗框会侧漏和地面反光；宽度需比窗宽多留20cm两侧包边86% similarUnverified购买前需测量总长度并留10-15%余量（拐角剪裁损耗），标准房门单扇约需5米（三边+门底），普通窗户单扇约需3-4米85% similarUnverified伸缩杆选购要让实际窗宽落在标称范围的中段而非极限值：如窗宽1.5米应选1.1-2米款而非最大1.5米款，杆体伸出越长内管重叠越少，承重和抗弯下降50%以上85% similar
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