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The roof can be changed, the ventilation pipe is generally in the corner of the wall, and a deep groove is opened in the wall to improve the pipe.
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Punching holes can create ventilation holes and make your toilet smelly even more.
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Isn't there an outer wall on his side? That's not good
The old house was renovated, and the ventilation pipe of the toilet was smashed, and the 70 PVC pipe
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If you look at the picture, the two holes should not be connected.
The toilet ventilation duct on the roof is 2 meters from the roof, which is in my garden to vent the
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Of course, there will be an effect, as you said, at least two elbows should be added, which will increase the resistance of the exhaust or the intake. But I don't know what that ventilation duct you are talking about is for?