A flap barrier is a type of pedestrian access control barrier commonly found in areas where secure access is required, such as office buildings, train stations, airports, and stadiums. It consists of a series of retractable flaps or panels that block or allow passage when activated by a valid credential, such as a key card, RFID tag, or biometric scan. When a valid credential is presented, the flaps open momentarily to allow the person to pass through. If an invalid or no credential is detected, the flaps remain closed, denying access. https://www.novusapl.com/flapbarrier-ultrapremium-series.php