The C190 is our largest high security cylindrical portal. Specifically designed for busy areas with high flows of people, this secure door can prevent tailgating through the APD ultrasonic sensors. Otherwise, it can be simply used as a prestigious and elegant entrance, in place of a revolving door. This security interlock system is also available in the versions approved to the LPS 1175: Issue 8 A1 (S1), B3 (S2), C5 (S3) for resistance to attacks. It is also available in many different versions.