High-end hotel-style bathroom

It is suggested that an exhaust fan should be installed in each bathroom. 1 10#PVC pipe should be used for the main pipe of each unit, 150#PVC pipe should be used for the outdoor main pipe, rain showers should be added on the 23rd floor, and movable shutters should be set at the branches to prevent gas from flowing back. This saves the use cost. Also, if it is a bathroom near the external wall, it can be directly exhausted by the exhaust fan of 1 10.