To perform hydraulic ventilation, a fog nozzle should be set on a wide fog pattern to cover what percent of the opening through which the smoke will be drawn or pulled?

Question

Quizplus · Accepted Answer

Hydraulic ventilation using a fog nozzle set on a wide fog pattern should cover 85 to 90 percent of the opening. This maximizes the effectiveness of the technique by creating a vacuum that pulls smoke out of the building through the opening.

To Perform Hydraulic Ventilation, a Fog Nozzle Should Be Set