Final answer:
Commercial highrises should not rely on natural ventilation as their primary ventilation method due to unpredictability and insufficient pollutant removal. Mechanical ventilation systems are essential for maintaining air quality.
Step-by-step explanation:
In a commercial highrise, natural ventilation methods such as opening windows and doors should generally not be used as the primary means of ventilation. These buildings often require sophisticated mechanical ventilation systems designed to handle high occupancy levels and to ensure that air quality meets health and safety standards. Natural ventilation can be unpredictable due to changing weather conditions and may not provide the consistent air exchange rate needed in high-density buildings.
Additionally, relying on natural ventilation alone is often insufficient for removing pollutants and may lead to increased levels of indoor air contamination if not properly managed, especially if there are specific products or appliances releasing pollutants. Therefore, well-designed mechanical ventilation systems that can control airflow and purify the air are crucial for these environments.