Unverified85% confidenceFactTime unknown
厂家标称换气量通常为无管道自由送风值，接管道后风量衰减30%-50%，选购时实际可用风量应按标称值×0.6估算，管道越长弯头越多衰减越大
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Unverified标称风量通常是无管道空载值，接入管道后因阻力实际衰减30-40%，管道式选购时应选标称风量比需求高1.5倍的机型90% similarUnverified自吸泵实际扬程需按'垂直提升高度+水平管长/10+每个弯头0.5m'折算总扬程，选泵扬程应比计算值高20%留余量，否则出水量断崖式下降72% similarUnverified浴室换气选风机时应看'静压'而非仅看风量，管道长度＞2米或有拐弯时需选静压≥100Pa的机型，否则实际排风量衰减50%以上72% similarUnverified岛台悬挂式（吊装）油烟机因无墙体挡风，实际吸油效率比同风量的靠墙侧吸机低约20-30%，选购时风量需比常规多留4-5m³/min余量72% similarUnverified自动充气阀（回弹海绵+阀门）舒适度和支撑均衡，但收纳后体积比纯吹气款大30-50%，且需卷压排气才能收小，追求极限便携应选纯气囊款69% similar
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