An HVAC system can be implemented to serve on many floors. The normal HVAC system that serves all the floors of a building is shown below. For this building, the stairwells are pressurized in the event of a fire. The distribution ducts on each floor are shown in the picture.
Smoke control by pressurization and exhaust:
In the event of fire in the system:
- The smoke damper in the return duct is open on the fire floor
- The rest of the smoke damper in the return duct are closed
- The smoke damper in the supply duct on the floor directly above and below the fire floor are open
- The rest of the smoke dampers in the supply duct are closed.
These damper settings are intended to:
- Concentrate exhaust on the fire floor
- Concentrate pressurization on the floor above and below the fire floor
- Prevent smoke from migrating to other zones through the return duct.
For this zoned smoke control system, the mode of operation of penthouse is explained in: click here
Smoke control by exhaust only:
The zoned smoke control consisting of the fire floor exhaust and exhaust of floor directly above and below the fire floor. In the event of fire in the system:
- The smoke damper in the return duct are open on the floor and floor directly above and below the fire floor.
- The rest of the smoke damper in the return duct is closed.
- All smoke damper in supply duct are closed.