Unverified85% confidenceDecision RuleTime unknown
国内油烟机排烟管主流管径为160mm（新国标）和180mm，老房多为160mm；购买前必须实测烟机出风口外径，公制铝箔管标称160实测常为152-158mm，需配套160转接圈避免漏烟
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Unverified国标公共烟道预留孔径多为160mm或180mm，家用油烟机出风口常见150mm，需配150转160/180变径圈或止逆阀法兰盘实现密封过渡90% similarUnverified选购前必须实测管道内径：常见公共烟道预留孔为160mm或180mm，油烟机排烟管多为160mm，买错口径会漏烟且无法卡紧85% similarUnverified气嘴长度需匹配轮圈高度：普通低框圈选40-48mm即可，中高框碳刀圈需60mm甚至80mm以上，否则气嘴露出不够无法正常连接气筒76% similarUnverified气嘴长度需匹配轮圈高度：轮圈框高≤30mm选40mm气嘴，40-50mm框高选60mm气嘴，气嘴外露螺纹应有15mm以上以便打气头夹紧76% similarUnverified气门嘴长度需匹配轮圈高度：低框轮圈（＜30mm）选40mm气嘴，中高框（40-60mm）需60-80mm气嘴，否则打气筒无法有效连接74% similar
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