General information about

smoke and heat exhaust (SHE)

Fire protection

Fire protection measures are grouped into the following categories:

Preventive fire protection
Preventive fire protection encompasses the protection of life and health and is intended to prevent fire and smoke from forming and spreading before they can become a hazard. ...mehr lesen

Safety objectives of a smoke and heat exhaust system (SHE)

Protection of human beings (active rescue)

Keep escape and rescue routes clear by removing smoke Full visibility for those trying to escape Save human lives.

Firefighting (passive rescue)

RauPathways for firefighting operations with low smoke formation Quick and targeted firefighting operations by the fire brigade Reduced risk to first responders.

Protection of property

Prevention of full-scale and secondary fires Reduction of devastating damage to the building caused by smoke.

Typical fire description without smoke removal

What does SHE stand for?

Subsumed under the umbrella term SHE are the following systems:

Natural smoke exhaust systems (NSE)
Smoke extraction by natural lift Suitable for stairwells, industrial structures, atriums, and similar types of buildings where thermal lift is capable of discharging smoke.


Mechanical smoke exhaust system (MSE)
Smoke dissipation by fans Suitable for industrial structures, atriums and similar types of buildings where thermal lift is insufficient for smoke extraction and must be bolstered by fans.


Smoke protection pressure system (SPP)
Smoke suppression by exerting positive pressure Suitable for stairwells in tall buildings and for safety stairwells where smoke must not penetrate emergency routes.


Spreading of smoke without smoke removal
A fire breaking out inside a building always progresses in an entirely different way from an outside fire. The measures intended to provide preventive fire protection must take this fact into account. Every fire releases thermal energy and smoke. Hot smoke rises to the top and fills the room. Unless removed by appropriate means, the smoke in combination with the fire and hot gases will eventually destroy the building.


Spreading of smoke with smoke removal
Smoke and heat are discharged quickly by means of convection (heat dissipation) for the following purposes: minimise smoke formation along rescue and escape routes, guarantee full visibility for those trying to escape, i.e. save lives, prevent the “flashover” effect (smoke ignition), and facilitate firefighting operations by allowing the fire brigade to fight the fire in a quick and targeted manner, thereby preventing secondary fires and preserving property.