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Personally, I feel that I need to, because in winter, I usually don't open the window, and this is when the exhaust fan is used.
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It should be used as an auxiliary exhaust.
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When doors and windows are closed, ventilation is required, so exhaust fans are needed.
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No, unless you have that need.
It is not installed, but it is recommended to install an exhaust fan, because it is better to use an exhaust fan when the temperature difference between indoor and outdoor is large in winter and summer. It's too cold to open the window.
There are windows that do not need to be installed, our house has not been used much since it was installed, and it is not firm when the wind is strong, and now it is fixed with tape.
Bathroom exhaust fans have special ducts. You take a closer look. Or ask about the property.
Install a bathroom exhaust fan, go to the hardware store and ask them will give it to you, the bath bomb can be installed in the back, and the power cord can be reserved in the ceiling, and then consider increasing it if you feel that it is not warm enough in winter.
Look for the kind of large plastic pipe (there is a special one) that can be bent to connect the outer surface.