Exhaust Air 

Exhaust air is the air that is expelled from a building or structure. This air is typically laden with contaminants such as dust, fumes, smoke, and other pollutants. Exhaust air must be removed from the indoor environment to protect occupants from exposure to these contaminants. There are several methods for exhausting contaminated air from a building or structure.

The most common method is mechanical ventilation, which uses fans to force the contaminated air out of the building. However, this method can be costly and energy-intensive. Other methods for exhausting contaminated air include natural ventilation and passive stack ventilation.

Natural ventilation relies on wind to move the contaminated air out of the building. This method can be effective if the wind direction is favorable; however, it can also introduce pollen and other allergens into the indoor environment. Passive stack ventilation relies on the difference in temperature between the indoor and outdoor air to create a pressure gradient that moves the contaminated air out of the building. This method is often used in combination with mechanical ventilation to improve efficiency and effectiveness.