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Anonymous users2024-01-23This round hole and rectangular hole are the ventilation holes that make it and the bundle of this sewer respectively.
As long as the air path is sealed and does not pour air, the size of the fan does not matter.
Both of these are possible, but according to common sense, the possibility of waterproofing problems in the bathroom is high, see if there is a buried water pipe in the bathroom wall corresponding to the watermark, and the possibility of leakage at the joint of the buried water pipe is the greatest, you can first check it by doing a pressure test on the water pipe.
First, it can be pasted with sticky note patterns to beautify; Second, if you don't want to beautify, you can fill it with white cement.
It is generally used for installing screws, wires, pipes through, air circulation and other functions.