NASCLA Accredited Commercial General ContractorSpecialties and EquipmentMedium
A general contractor is installing an automatic revolving door system at the main entrance of a commercial building. Which of the following safety features is mandated by building codes and industry standards to prevent entrapment and ensure pedestrian safety?
- APresence sensors and emergency stop buttons.
- BManual override for continuous rotation during peak hours.
- CIntegrated intercom system for emergency communication.
- DTinted glass for glare reduction.
Show answer & explanationAnswer & explanation
Correct answer: A. Presence sensors and emergency stop buttons.
Presence sensors detect pedestrians and stop or slow the door to prevent entrapment, while emergency stop buttons provide a direct means for occupants to halt the door in a hazardous situation, both of which are critical safety features for automatic revolving doors.
Why the other options are wrong
- B. Continuous rotation override would increase, not decrease, entrapment risk.
- C. An intercom system is for communication, not direct entrapment prevention.
- D. Tinted glass is an aesthetic and comfort feature, not a primary safety mechanism against entrapment.
Revolving Door Safety
Safety features integrated into automatic revolving doors to prevent pedestrian injury, particularly entrapment, and ensure safe operation.
- Mandated by building codes and ANSI/BHMA standards.
- Includes sensors to detect presence and prevent crushing.
- Emergency stop buttons allow immediate manual halt of operation.
Memory trick: Automatic doors must 'Sense' you and have a 'Stop' button.