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JetVent Impulse Exhaust System

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 heavy metal compounds.

Coles Refrigeration and Air Conditioning can design a car park ventilation system to suit any of your needs from the standard ducted type systems to the more energy efficient and practical Impulse ventilation systems.

The most significant development in car park ventilation design has been the introduction of Impulse Ventilation. It 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 systems 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. A number of National Fire Authorities in Europe now insist on Impulse Ventilation for car parks.

Conventional Ducted System

Conventional Ducted System

Impulse Ventilation System

Impulse Ventilation System

How it Works

JetVent Fans operate 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 quantity 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 for air distribution ductwork within the car park.
  • Mechanical supply and exhaust systems with less resistance, smaller fans and lower power consumption.
  • Ventilation risers and plant rooms reduce in size and quantity, making the car park more open and possibly yielding additional car park spaces.
  • Possibility of increasing the number of control zones in the car park. Typically brings gains in operating energy efficiency 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 fans can be very flexible resulting in lower floor-to-ceiling heights.
impulse fan

Workings of JetVent or Impulse Fan

Fan Specifications

The capacity of a single fan increases with its thrust rating. All car park JetVent Fans are rated according to this in Newtons (N) of thrust.

All JetVent Fan types are tested to the following Standards:

  • Thrust performance based on tests to BS848: Part 10:1999.
  • Noise data based on tests to BS848: Part 2:1985.
  • Axial and Centrifugal units tested for smoke spill requirements as outlined in AS4429:1999.

Please do not hesitate to contact one of our experienced sales engineers to design and construct your next car park ventilation project.