Smoke and heat exhaust ventilation systems
Smoke and heat exhaust ventilation systems are a central component of preventive fire protection and effectively protect people and buildings. Fires pose a major threat due to heat, flames, and especially toxic smoke, causing many fatalities and significant property damage every year. Fast and reliable smoke extraction is therefore essential. SHEV systems safely direct fire gases, hazardous oxides, and thermal energy outside in the event of a fire, keep escape routes smoke-free, and thus enable rescues. At the same time, they protect the building structure from thermal damage and maintain building stability.
Smoke and heat exhaust ventilation systems (SHEV)
Thermal buoyancy principle
In the event of a fire, smoke and combustion gases rise within the building due to thermal buoyancy and accumulate below the ceiling, forming a smoke layer that fills the entire room within a very short time. Through smoke exhaust openings in the upper area of the façade or roof, the smoke and heat can escape to the outside. At the same time, supply air openings in the lower area ensure that the thermal buoyancy is increased and the smoke extraction is efficiently supported.
Protection objectives
Preventive fire protection cannot fundamentally prevent fires in buildings. However, protection objectives can be achieved by means of SHEV.
Personal protection (active rescue)
- Keep escape and rescue routes safe by smoke extraction
- Clear visibility for evacuees
- Save lives
Firefighting (passive rescue)
- Smoke-free access routes for firefighting
- Fast and targeted firefighting by the fire brigade
- Reduced risk for emergency personnel
Property protection
- Prevent total loss and secondary fires
- Reduce major building damage caused by smoke
Components of a SHEV system
SHEV systems essentially consist of the following system components. If the system is also to be used for ventilation, additional components such as room temperature controllers, wind/rain sensors, or ventilation switches should be selected.
General questions about smoke and heat exhaust ventilation systems
Here you will find answers to the most important questions.
