Fly My Hummingbird

Hi. In the apartments bathrooms, or in fact in all bathrooms, there are air conducts that refresh the air inside the bathroom even when the door is closed. Usually there are air conducts in the top and near the ground of the bathrooms, there can be both or there can be only one of those. Those air conducts go either to an exit (exaustion) on the floor near the street or to an exit on top of the building. If those air conducts aren't well taken care of and free from garbage that could accumulate, the problems start. No air flow can lead to the degradation of the apartment or house, and I believe it should be verified over time.Over and over. Just to make sure the air is flowing properly, and so the house is healthy and the air from the house clean. This seems to me a great problem that could affect if not many, most of the houses in the world. Thank you :)