Excuse me, is there no vent in the bathroom?

If the bathroom does not have a preset vent, but there is a window, that is, the design is to open the window for ventilation, you can renovate the window, change it to two floors, the lower floor is movable left and right to push and pull can be free to open the window ventilation type (the window can not be opened in winter), the upper floor is changed to a fixed one, install an exhaust fan, and can discharge turbid air to the outside at any time, which is very simple and the cost will not be very high.

It's by the exhaust fan. The exhaust fan should choose the appropriate power according to the size of the bathroom, especially the one with a small working sound of the motor. If you are taking a bath in the bathroom, then you should choose a more powerful exhaust fan.

In addition, to make the exhaust fan work better, you should leave a good air inlet for the bathroom.

Exhaust fans can be installed on the ceiling, walls and windows of the toilet to discharge the dirty air directly to the ventilation duct or outside to achieve the purpose of ventilation in the bathroom. For houses that do not have vents in the building, you can install a set of ventilation ducts to open to the outside. In addition, artificial ventilation can make passive ventilation become active ventilation, and timely ventilation can effectively keep the air in the toilet fresh.

Hello. I can't see your drawings, so I can't say much.

The vent goes from the exhaust hood outlet in the kitchen next door? It should be an exhaust vent, right? This is okay, here you need to pay attention to the exhaust pipe must be installed a check valve to prevent the smell of the exhaust pipe well from backing up.

Also, my advice is not to rush into action, and it may be helpful to have a chance to see what your neighbors are doing.