What effect does negative ventilation have on smoke and toxic gases within a space?

Negative ventilation is a technique used to manage air quality within a space, particularly in situations where smoke and toxic gases may be present. When negative ventilation is employed, the pressure inside a room or area is reduced relative to the external environment, creating a low pressure area. This difference in pressure effectively draws air, including harmful gases and smoke, out of the space.

The primary function of negative ventilation is to ensure that contaminated air is expelled, promoting a safer and healthier environment. By establishing a low pressure zone, negative ventilation facilitates the movement of unwanted gases out of the building, preventing their accumulation and minimizing potential health risks.

This principle is particularly crucial in emergency situations, such as during a fire or chemical spill, where the removal of smoke and toxic gases is necessary to protect occupants and first responders.