A valve installed in the air outlet system of a chamber for the discharge of ventilated air required amount of which depends on the number of chamber occupants and pressure. The manually operated valve has a scale from 0 up to xx persons and discharges out of the chamber for each person 30 (50 with tunnelling locks) working litres air/min. In addition this valve can be used for pressure relief in the chamber.
A system of ventilating air nozzles and solenoid valves installed in the air outlet system for the discharge of ventilating air required amount of which depends on the number of chamber occupants and pressure. Air out-let is remote-controlled from the control stand (step switch or bus) through opening of a specific combination of solenoid valves / nozzles.