When more than 20 inches from a vent hood, where should the air intake be located?

The correct placement of an air intake when it is more than 20 inches from a vent hood is on the same wall. This positioning allows for better airflow dynamics and ensures that the intake effectively captures the air that is being exhausted from the vent hood. By placing the intake on the same wall, any negative pressure created by the ventilation system will be balanced more efficiently, minimizing the risk of drawing in undesirable air from other, potentially contaminated areas.

Choosing to place the air intake on different surfaces, such as the ceiling, an adjacent wall, or the floor, could lead to inadequate airflow or create pressure imbalances that may hinder the performance of the entire venting system. Thus, the most effective strategy for maintaining optimal ventilation and performance is to position the air intake on the same wall as the vent hood when more than 20 inches away.