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C4 Double Cylindrical Portal

The C4 Security Portal features two independently operated portals, doubling throughput within one secure space-saving solution. This double-entry portal is for high-traffic areas with limited space.

The C4 cylindrical security portal is a state-of-the-art solution for high-traffic areas with limited space. This double-entry portal employs cutting-edge APD ultrasonic checks to ensure that only authorised individuals are granted access through the secure side door.

Thanks to its precise interlock system, the C4 double security portal prevents the inner and outer doors from being opened simultaneously, offering an extra layer of security. Additionally, this portal has two independently operated portals, doubling the throughput within a single, space-saving solution. With its advanced technology and innovative design, the C4 cylindrical security portal is the ideal security solution for businesses and organisations looking to enhance their security measures while maximising their use of space.

  • Anti-Tailgating
  • Anti-Vandal
  • Connectivity
  • Customisable
  • High Throughput
  • High-Security
  • Touchless

Standards & Certifications

  • Vandal Resistant glass P2A-EN 356
  • FB2/NS EN 1522 Top Canopy
  • FB4/NS EN 1522 Metal Structure
Standard Feature Option
External Diameter x Depth 1750mm x 988mm
Internal Diameter x Height 820mm x 2048mm – 2050mm
Entrance Width 600mm
External Height S: 2382mm R: 2320mm
Safety and Security
Safety Features Anti-slip Floor mat
Emergency unlocking device
Fail secure
IR safety sensors
Internal LED light
Fire alarm signal (Unable to open external and internal door simultaneously)
Emergency Emergency lever, handle or crank Additional Internal Emergency Lever | Additional External Emergency Lever
Security Ratings FB2/NS EN 1522 Top Canopy
FB4/NS EN 1522 Metal Structure
Attack Resistant x x
Vandal Resistant Glass P2A-EN 356 P4A-EN 356 | P6B-EN 356 | P7B-EN 356
Bullet Resistant Glass BR3-EN 1063 | BR4-EN 1063
Secure by Design Accredited x x
Detection Infrared presence sensors APD – Anti Piggybacking Device | Pressure Mat | 2 Zone Pressure Mat |  Reed door position tamper sensor
Connectivity Intercom (included in the traffic light)
LED Traffic lights
Web LAN Control | Internal Alcove for Access Control Systems
Control Service mode keyswitch or Multi-function control panel Additional Control Panel with Display | Emergency Exit Control Panel | 4” TFT monitor for Control Panel | Night Lock
Additional Information
Version S: Welded portal structure with 70mm floor base –
(recessed or surface mounted)
R: Rail floor guide 12mm base – (surface mounted installation only)
K: Portal delivered in sections to be assembled at the installation site.
Extended Height Version
Design RAL colour (sliding door frames RAL 9005 – black) Polished steel | Brushed steel | Aluminium | RAL pearl colours

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24-Hour Tailgating Prevention for 21st-Century Research

“Meesons have succeeded in providing an added level of secure access to a high profile building.”

Head of Security 

Francis Crick Institute

Since 1998, our partnership with Alluser has created a unique market for high-security portals, making record-breaking achievements together. We couldn’t be more grateful for Allusers expertise in this field and for helping us overcome the security challenges that our customers face.