Background
Mechanical pressurisation systems are designed around a target differential, but duct resistance, leakage and fan degradation all push the real value off design. Too little differential lets smoke backflow; too much makes the escape door impossible to open. Both are hazards.
How it works
Pressure sensors measure the differential between the vestibule or stairwell and the corridor. The controller modulates a damper actuator to hold the target band — typically 25–30 Pa for vestibules and 40–50 Pa for stairwells — in closed-loop control.
Key capabilities
- Closed-loop control across two bands: 25–30 Pa vestibule, 40–50 Pa stairwell
- Main and sub-module pairing lets one controller cover multiple floors
- Stepless damper modulation avoids repeated bypass valve cycling
- Optional CO detection and air quality linkage for underground car parks
Questions and answers
What is the core value of Pressure Differential Monitoring?
Holds the pressure difference between vestibule and corridor — enough to keep smoke out, low enough to open the door
What problem does it solve?
Mechanical pressurisation systems are designed around a target differential, but duct resistance, leakage and fan degradation all push the real value off design. Too little differential lets smoke backflow; too much makes the escape door impossible to open. Both are hazards.
How does it work?
Pressure sensors measure the differential between the vestibule or stairwell and the corridor. The controller modulates a damper actuator to hold the target band — typically 25–30 Pa for vestibules and 40–50 Pa for stairwells — in closed-loop control.