The odor of the hood may not be sealed at the exhaust pipe and flue. If the exhaust pipe is under the ceiling, it can be sealed with tape or sealant. If it is above the ceiling, remove part of the pipe and glue it with glass. The two sides of the exhaust hose may not be tightly connected, causing them to fall off or break off, making them smell bad, so the exhaust pipe should be replaced.

　　个方面：排气管和公共烟道没有密封；

　　The first aspect is that the exhaust pipe and the public flue are not sealed.

　　解决方案：如果引擎盖管在天花板下，请考虑使用透明胶带将其紧紧包裹，或者用玻璃胶或密封剂将其密封。 如果引擎盖管在天花板上方，则有两种情况。 如果是集成天花板，则取一小块并用玻璃胶密封。 如果是板条形天花板，请去除天花板的一部分以使其胶粘。

　　Solution: If the hood tube is under the ceiling, consider wrapping it tightly with transparent tape or sealing it with glass glue or sealant. If the hood tube is above the ceiling, there are two cases. If it is an integrated ceiling, take a small piece and seal it with glass glue. If it's a slab ceiling, remove part of the ceiling to make it sticky.

　　第二方面：抽油烟机的排气风门，止回阀的两个半圆形活动阀瓣，在空气排出时打开，在停止时关闭，但油腻越多，运动受限 襟翼，即使不打开，烟雾也无法排出；

　　Secondly, the exhaust valve and two semi-circular movable discs of the check valve of the lampblack machine are opened when the air is discharged and closed when the air is stopped, but the more greasy the lampblack machine is, the movement restriction flaps can not be discharged even if they are not opened.

　　解决方案：更换单向阀或清洁单向阀。

　　Solution: Replace one-way valve or clean one-way valve.

　　第三方面：抽油烟机的排气软管，两端之间的连接不严密，脱落，断裂会引起漏气和反味；

　　Third, the exhaust hose of the lampblack machine is not tightly connected between the two ends, falling off and breaking will cause leakage and odor.

　　解决方案：更换排气软管或拧紧排气软管。

　　Solution: Replace or tighten the exhaust hose.

　　第四方面：烟道问题，由于烟道的拆除，破裂，堵塞，烟雾或房间上楼的烟泄漏，或将管道更换成管道，导致烟气吸收不良，烟气阻塞，产生反味。 出于同样的原因，如果浴室的排气管也是问题的原因。

　　Fourth aspect: flue problems, due to the removal of flue, rupture, blockage, smoke or smoke leakage upstairs, or the replacement of pipes into pipes, resulting in poor absorption of flue gas, smoke blockage, produce a bad smell. For the same reason, if the exhaust pipe in the bathroom is the cause of the problem.

　　解决方法：这个原因比较难解决，好找到一个属性。

　　Solution: This reason is more difficult to solve, it is better to find an attribute.