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There are windows, but they are closed in winter, so you still have to install ventilation fans.
The bathroom is 3 square meters, and it would be nice to install LED lights with 3W. >>>More
The bathroom is more humid, it is recommended that you choose a plastic gusset, which is beautiful and moisture-proof, and saves money.
The bathroom should be equipped with a two-in-one ventilation fan for lighting and ventilation, and it is inconvenient to install an exhaust and a lighting separately. Because the integration is good.
Generally, the pipe of the exhaust fan in the bathroom is about ten centimeters, and you can match the appropriate pipe when you buy the exhaust fan.
There are no windows, there will always be ventilation ducts. Install suspended ceilings, install exhaust fans, or integrate lighting, heating, blowing, ventilation and other functions in one.