In a residential property, with properly installed and working smoke alarms, which system further reduces the risk of fire death by about 82 percent?

• A. Fire sprinklers
• B. Carbon monoxide detectors
• C. Fire doors
• D. Security lighting

Answer: (A)

Fire sprinklers provide automatic fire suppression that dramatically lowers the chance of death after a fire starts, especially when smoke alarms are already present for early warning. Sprinkler systems respond to heat, and typically only the sprinkler heads closest to the fire release water, containing the flames, reducing heat and smoke spread, and giving occupants more time to escape while responders arrive. This active response is what leads to the substantial reduction in fire fatalities—around 82 percent in homes with working smoke alarms.

Carbon monoxide detectors protect occupants from toxic gas but do not stop or slow a fire. Fire doors can slow the spread of flames and smoke but rely on proper use and may not activate automatically. Security lighting helps with visibility during egress but does not influence how a fire grows or is suppressed.