Do you have exhaust fans in your bathroom? My house is going to be renovated. The designer said that

Do you have a bath bomb installed in your home? If there is a bath bomb, it comes with exhaust, if not, it is necessary to install an exhaust fan, because the bathroom is humid, and there is heat when taking a bath, it cannot be excluded, if there is no ventilation fan, the gas will be stringed from the door hole to the room, and some objects in the room have an impact (such as electrical appliances or something).It is better to install a ventilation fan.

If you want to install an exhaust fan, the smell of the bathroom is discharged by the skylight alone.

Toilet skylight??? How many floors does your house have? The exhaust fan is better, but the cold wind blows in the winter but it suffers, I don't know where you are, whether it is cold in winter or not, it is best to install a plate outside the exhaust fan to block it, mainly to exhaust odor.

The bathroom must be equipped with an exhaust fan, and opening the window is not ideal for ventilation.