Mantrap (access control)

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A mantrap, security mantrap portal, airlock, sally port or access control vestibule is a physical security access control system comprising a small space with two sets of interlocking doors, such that the first set of doors must close before the second set opens.^[1][2][3][4] Airlocks have a very similar design, allowing free ingress and egress while also restricting airflow.

In a manual mantrap, a guard locks and unlocks each door in sequence. An intercom and/or video camera are often used to allow the guard to control the trap from a remote location.

In an automatic mantrap, identification may be required for each door, sometimes even different measures for each door. For example, a key may open the first door, but a personal identification number entered on a number pad opens the second.^[5] Other methods of opening doors include proximity cards or biometric devices such as fingerprint readers or iris recognition scans. Time of Flight sensors are used in high security environments. Newer stereovision detection systems are often employed.

Some security portal mantraps use dual authentication, employing 2 separate readers (security card plus biometrics, for example). This is very typical in the data center security entrance control environment.

Security mantrap portals typically offer options for all steel construction and BR (bullet/ballistics) or RC (burglar protection) construction including thick laminated curved glass.

Metal detectors are often built in to prevent the entrance of people carrying weapons. This use is particularly frequent in banks and jewelry shops.

Turnkey systems are sometimes provided by some suppliers due to the need for specially trained installers.

Fire codes^[where?] require that automatic mantraps allow exit from the intermediate space while denying access to a secure space such as a data center or research laboratory.^[6] A manually-operated mantrap may allow a guard to lock both doors, trapping a suspect between the doors for questioning or detainment.^[7]

• Mantrap (snare)
• Sally port
• Optical turnstile

• "Frequently asked questions". Kouba Systems. Archived from the original on July 21, 2012. Retrieved 12 July 2012.
• "The AI Revolution and What it Means for Data Center Security Design" (McGovern, October 2024)