Business center 135

Jet Fans for Smoke Extraction

Task - Height of Premises

Many buildings in Vilnius centre have underground parking lots.

The height of underground parking lot is often determined by smoke extraction systems that are mandatory in this type of premises. It depends on air duct systems. However, with the application of modern smoke extraction technologies, air duct systems can be avoided thus allowing the investors to reduce construction cost or enabling them to use the saved height to expand other floors of the building.

Overview of Technology

In this site, jet fans were used for smoke extraction.

The technology of this system is based on tunnel effect when air flow is generated at the velocity sufficient to “sweep” the ventilated surface. The use of this technology makes air duct system no longer necessary thus reducing the cost of mounting works and materials.

This ventilation system consumes less power.

Overview of Technology

In case of fire, jet fans prevent smoke from spreading in the whole area. Smoke is blown to one side of the area.

This facilitates the evacuation of people and helps firefighters to find the point of origin of fire. When there is no fire, jet fans operate as CO exhaust gas extractors.

If CO levels exceed the maximum permissible levels, CO sensor is triggered and jet fans are activated.

The size and number of jet fans is selected by conducting fire simulations with a dedicated software.

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