 When there is a smell comming from the air injection systems.
Remains of dirtiness over the tables that are bellow the air injection.
Presence of smells like perfumes, kitchen, bathroom when entering the building.
People begins to sneeze or their noses itch when they turn on the HVAC systems.
The HVAC systems commonly have more than 2 years old and have never been cleaned.
Thermostats are under the control of occupants, that can turn it off and on and adjust the temperature at will. This causes that interior air gets stuck or dead because it never gets renewed.
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