A gas boiler rollout is considered to be:

• A. Normal
• B. Unsafe
• C. Very dangerous
• D. Rare

Answer: (C)

Rollout means flames or hot combustion gases are escaping from the burner area into the appliance cabinet or beyond, usually because the venting/draft is blocked or a safety control has failed. This creates an immediate fire and exposure hazard: it can ignite surrounding materials, overheat components, and push dangerous combustion products like carbon monoxide into living spaces. Because of that direct flame and rapid heat risk, rollout is far more severe than a typical unsafe condition. It demands an immediate shutdown and a professional inspection, rather than a routine service. That level of danger is why the best description is that rollout is very dangerous.