What should be done to set the exhaust during negative ventilation?

To effectively set the exhaust during negative ventilation, maintaining a high airflow is essential. This high setting ensures that any contaminants or air pollutants are efficiently removed from the space. Negative ventilation works by creating a lower pressure within a designated area, which helps pull in fresh air from outside. A high exhaust setting maximizes the airflow, enabling a more rapid exchange of air and improving air quality within the environment.

On the other hand, lower settings or turning off the exhaust would hinder the negative pressure effect, potentially allowing buildup of hazardous substances or static pressure issues. While a medium or variable setting may seem sufficient, they do not provide the same level of efficiency required for optimal negative ventilation compared to a high setting. Therefore, selecting a high exhaust setting is paramount for success in maintaining an effective negative ventilation system.