Introduction to Car Park Impulse Ventilation

The ventilation of car parks is essential for removing vehicle exhaust fumes containing harmful pollutants.


Some of these pollutants include :

• Carbon Monoxide (CO)

• Nitrous Oxides (NOx)

• Sulphur Dioxide (SO2) and other heavy metal compounds.


Today, the most significant development in car park ventilation design has been the introduction of IMPULSE VENTILATION.

Impulse Ventilation is an innovative alternative to traditional systems and provides a number of significant benefits. An Impulse Ventilation System is based on a number of small high velocity JETVENT FANS that either replace traditional distribution ductwork in closed car parks or increase cross-flow ventilation in open car parks.

In addition to removing pollutants, the ventilation system may also provide assistance to fire fighters by either limiting the spread of smoke in the event of a fire or clearing smoke after the fire is extinguished.

Impulse Ventilation originated in Europe and has been widely used around the world for both Car Park Ventilation and Smoke Management Control Systems. The JetVent Impulse Ventilation System is being installed to increase the efficiency of car parks throughout Australia, New Zealand & South East Asia.


JetVent Fansoperate on well proven longitudinal tunnel ventilation principles. The fans produce a high velocity jet of air, in turn moving a larger quantity of air surrounding the fan through a process known as entrainment.

The amount of air entrained by a single fan increases with the velocity and the quality of air being discharged by the fan. These characteristics directly relate to the thrust rating of the fan which is measured in Newtons (N).


• Largely eliminates the need of air distribution ductwork within the car park.

• The mechanical supply & exhaust systems have less resistance & therefore require smaller fans that consume less power.

• Ventilation risers and plant rooms reduce in size and quantity making the car park more open and possibly yielding additional car park spaces.

• Increasing the number of control zones in the car park may be possible. This can increase the energy efficiency of the system over and above the best ducted car park ventilation systems.

• Great potential for reduced excavation and construction costs. System is small in vertical profile and the placement of the fans can be very flexible resulting in lower floor to ceiling heights.