Smoke and heat exhaust ventilation systems

The smoke emitted by fires represents the greatest threat to people and the building. For this reason, it is extremely important that the smoke be extracted quickly and reliably. In this case, smoke and heat exhaust ventilation systems, as a fixed integral part of preventive fire protection, take over the most important task, namely discharging combustion gases, dangerous oxides and thermal energy outdoors in event of fire. Inn this way escape and rescue routes are kept virtually free from smoke, thus allowing active and passivle rescue. Furthermore, this avoids the thermal load imposed on the building structure by hot fire gases leading to damage to the building.

Components of a SHEV system

Gretsch-Unitas offers you a wide assortment of mutually compatible system components – from electric motor-driven chain and spindle drives through to SHEV central control systems and an extensive range of accessories. Complete opening systems for Bottom-Hung, Top-Hung as well as inward and outward opening Side-Hung windows are also included.

SHEV systems are not only suitable for smoke exhaust in the event of fire, they can also be used for everyday ventilation which means they cover virtually all possible application requirements.

Electric control unit (SHEV central control unit)

The electric control unit of the smoke and heat exhaust ventilation is performed by the SHEV compact control unit. This is equipped with extensive setting and application functions as well as offering clear status messages via LED displays. Windows, smoke flaps and light domes are opened or closed by electric drives.

The ventilation function is controlled via a ventilation push-button, rain/wind controller or time switch, and in the event of an emergency it is controlled manually via a SHEV push-button or automatically via smoke or heat detectors. In addition, alarm signals can be connected.


In natural smoke and heat exhaust ventilaton devices (NSHEVs), the window element is tested and certified together with the drive as an entire system in accordance with EN 12101-2. Gretsch-Unitas offers NSHEV system solutions with tested, certified components for timber profiles and Euro-groove aluminium profiles from leading system suppliers in all conventional opening types.

Rauch- und Wärmeabzugsanlage

Smoke exhaust

Smoke exhaust refers to the extraction of smoke in the event of a fire (heat extraction), in order to create a low-smoke layer near the ground and thus enable the safe use of escape and rescue routes.
The products used here are safety-relevant building products that are regulated by EN 12101-2 in Building Rules List B, part 1.
In these cases, NSHEV are required as part of SHEV.

Areas of application:

  • Public assembly places
  • Large warehouses
  • Industrial buildings

Smoke ventilation

Smoke exhaust systems in stairwells are referred to as smoke ventilation. Their purpose is to extract smoke by way of cold smoke exhaust. The products used here are non-safety-relevant building products that are therefore only listed in Building Rules List C, part 3.10.
Planning takes place in accordance with the specifications of the respective applicable regional building regulation (LBO). Crucial aspects include the location, size and opening width of the smoke exhaust apertures, as well as the number and location of automatic and manual alarm devices.

Areas of application:

  • Stairwells

Leave no questions unanswered

If you have any questions or need further information, feel free to write to us – we will be pleased to help.

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