Air circulation systems in flats with a protected stairway or entrance hall enclosure

For systems circulating air only within an individual flat, take all of the following precautions.
a. Transfer grilles should not be fitted in any wall, door, floor or ceiling of the enclosure.
b. Any duct passing through the enclosure should be rigid steel. Joints between the ductwork and enclosure should be fire-stopped.
c. Ventilation ducts serving the enclosure should not serve any other areas.
d. Any system of mechanical ventilation which recirculates air and which serves both the stair and other areas should be designed to shut down on the detection of smoke within the system.
e. For ducted warm air heating systems, a room thermostat should be sited in the living room. It should be mounted at a height between 1370mm and 1830mm above the floor. The maximum setting should be 27°C.
NOTE: Ventilation ducts passing through compartment walls should comply with the guidance in Section 9.