Mantraps limit access to secure areas within a facility while providing an effective means to physically detain unauthorized persons until security provides clearance. In its most basic form, a mantrap is comprised of a set of doors that requires the person to enter the first while the others are closed. Mantraps are typically manual swing doors forming a vestibule but can also use sliding doors or gates. Some mantraps use turnstiles or revolving doors.
Once inside the first door, the person cannot pass through the second door until the first door is closed.