Wind in rooftop ventilation openings should be addressed how when winds are strong?

• A. Openings must be adjusted based on wind, which can alter airflow and smoke direction
• B. Wind speed has no effect on opening management
• C. Openings should always be small in windy conditions
• D. Vent only from the lowest opening

Answer: (D)

Wind conditions change how roof openings affect airflow and smoke movement. Strong winds create crossflow around roof openings and can push smoke and heat horizontally, sometimes driving it back into the fire area or toward firefighters. By venting only through the lowest opening, you establish a more predictable, gravity-assisted exhaust path that is less susceptible to wind-driven backflow and crossflow between multiple openings. This reduces the chance of wind pushing smoke into the structure and helps keep the ventilation flow directed away from crews. Other approaches that introduce higher or multiple openings tend to invite wind-driven misdirection of the exhaust, making conditions harder to control.