Which device should not be used for an elevator lobby in a parking garage?

• A. Heat detector
• B. Carbon monoxide detector
• C. Alarm bell
• D. Smoke detector

Answer: (D)

In an elevator lobby inside a parking garage, the air is full of vehicle exhaust and dust. A smoke detector in that environment is prone to frequent false alarms from everyday fumes and particulates, which can erode its reliability exactly when you need a real fire warning. Carbon monoxide detectors are far more appropriate here because they respond to combustion byproducts from vehicles, providing a meaningful early warning without being triggered by normal exhaust buildup. Alarm bells and other notification devices are still part of the system to alert occupants, and alternative detectors like heat detectors may be used in other areas, but smoke detectors are not suitable for this setting.