Ventilation in the bathroom is very important. A badly ventilated bathroom will always be moldy. This situation has a very strong impact on health. When we have to heat the water in the bathroom in which the fuel is burned, it can even get poisoned by smoke or fumes. which often leads to death. When we have poor ventilation, we have to wonder what is wrong. Is the ventilation duct clogged? Is there a lack of fresh air because the windows are too tight? To check the installation, periodically you need to call a ventilation specialist who will check the correctness of the ventilation system.