The following indicators are good signs for determining if there are indoor air quality problems due to ventilation and air conditioning systems:
- Odour coming from fans.
- Fibreglass or dirt residues on tables located under the air ducts.
- Odours such as perfumes, kitchen, bathroom, etc. noticed upon entering the building.
- People start to sneeze or have itchy noses when the air conditioning system is turned on. These systems are typically over 10 years old and have never been cleaned (unless their filtration is exceptionally good). Thermostats are controlled by the occupants, who can turn them on or off and adjust the temperature as they wish. As indoor air is not changed, it becomes stagnant and stuffy.
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