What action should you take if you see a propane cylinder on the roof during ventilation?

• A. Continue ventilation as normal
• B. Move cylinder to interior to keep it away from wind
• C. Cover cylinder with tarp
• D. Evacuate the area and coordinate with appropriate units to secure the cylinder and manage gas hazards

Answer: (D)

A propane cylinder on the roof during vertical ventilation creates a serious gas hazard that must be managed by trained personnel. The best action is to evacuate the area and coordinate with the appropriate units to secure the cylinder and address the gas hazards. By pulling back personnel and calling for the right specialists, you reduce the risk of gas release, cylinder rupture, or ignition near the fire scene while responders isolate the cylinder and handle the gas source safely.

Continuing ventilation, moving the cylinder yourself, or covering it with a tarp are not appropriate because they can worsen the hazard: moving or masking the cylinder can trigger a leak or hidden danger, and continuing ventilation could disperse or concentrate flammable gas in the area. The priority is safety and securing the gas source with proper equipment and expertise.