I overheard one staff complaining about his air-conditioning unit that needs to be replaced immediately within the next two days. Well, if you can see how poorly the building was designed, you will understand his sentiments and predicaments about staying in a congested high-rise condominium with poor ventilation system. If I were him, I would definitely require humidifier filters to be installed in my unit as well as it would at least give me a little comfort during highly humid summer days. To me, good airflow is very important. Even when you live in the middle of the city, with the filters installed inside your home, it would be so much more different than without it.