• Car Park Ventilation

Ventilation in applications such as fully enclosed car parks, vehicle bays and metro stations provides an exchange process of air, bringing fresh air in, thoroughly mixing the air, then extracting harmful pollutants, in particular, carbon monoxide, nitrous oxides, fumes from vehicle fluids, oil and other fuels.

The need for ventilation is of equal importance to smoke dispersal in the event of a fire, safeguarding lives by providing smoke clearance for occupants to escape, and enabling access for fire fighters to control fire risk.

Ventilation of car parks using impulse fans has been in use in Europe for more than 10 years and is becoming increasingly popular. This innovative approach provides major benefits in terms of reduced installation and running costs as well as smoke control.

The system of impulse ventilation is based on a number of small high velocity fans in place of the distribution ductwork. Impulse fans operate on well proven tunnel ventilation principles, producing a high velocity jet which thrusts against the air in front of the fan imparting momentum to all the surrounding air through entrainment as it diffuses. The volume of entrained air is significantly greater than the air quantity passing through the fan.

The impulse fans are carefully positioned to direct the airflow towards the main extract fan intake points. The main extract fans are sized to provide the required flow rates, but given the reduced need (or complete elimination} of intake-scavenge dueling within the car park area, do not have to overcome the system resistance inherent in a fully ducted ventilation system.

The major differences between traditional mechanical and impulse ventilation systems are:

The distribution ducting used in traditional systems is replaced by a number of small impulse fans to direct the airflow across the car park. Without the distribution duct resistance, smaller exhaust and supply fans and/or motors can be used. For impulse systems with smoke control design objectives, the airflow rates are calculated based on a design fire size rather than the prescribed number of air changes per hour.

Elta Fans provide a wide range of ventilation products for car park ventilation, so for more information, please look at examples of typical products that could be used, or alternatively, please contact us to discuss your specific application requirements