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You mean vent dust go throught the garage ceiling?
Dust要是贯穿车库的隔墙和顶。它要经过车库，多半是从ceiling上面走，并有保温棉护着。
Yes, it is as you said.
先试着把屋里的门窗全关好，出风口关上，要是有回风口，也用东西把它罩起来。然后把车库门关紧，在车库里点上几柱味道重些的熏香什么的－－千万注意防火。
待香燃尽，看看屋里有什么味道。然后打开回风口试试，最后再试试打开出风口。
要是熏香的味道真能跑到屋里，就真得找人看看啦，garage往屋里漏气不是小事。
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Good idea,but where has 薰香for sale? which one is回风口? which one is 出风口, I know on the ground is the air vent for warm air( I don't have air condition yet), there have some on the wall upper near the ceiling, are they 回风口还是什么?