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Integrated Car Park Ventilation Solutions

Integrated Car Park Ventilation Solutions


Fantech’s JetVent Car Park Ventilation System provides an innovative solution that uses demand control ventilation to help ensure a high standard of air quality whilst minimising energy consumption. It utilises the Fantech’s Aviator controls to digitally connect JetVent fans, Supply & Exhaust fans, Sensors and the Building Management System (BMS) together. This connectivity reduces installation time, capital cost, creates a higher level of system monitoring, seamless control and fast commissioning.
The ventilation of car parks is essential for removing vehicle exhaust fumes containing harmful pollutants. Some of these pollutants include Carbon Monoxide (CO), Nitrogen Dioxides (NO2 ), Sulphur Dioxide (SO2 ) and heavy metal compounds.
The JetVent ventilation system is based on a number of small high velocity JetVent fans that replaces traditional distribution ductwork in closed car parks or increases cross-flow ventilation in open car parks. JetVent is an alternative option for mechanical ventilation, and be used in place of both traditional ducted and non-ducted car park systems.
JetVent ventilation system types
Fan Specifications
The capacity of a single fan increases with its thrust rating. All JetVent car park 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.
  • Advantages
  • Largely eliminates the need for air distribution ductwork within the car park.
  • The mechanical supply and exhaust systems have less resistance and 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 maybe 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 fans can be very flexible resulting in lower floor-to-ceiling heights.
  • 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 quantityof 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).
    Figures 1(a) and 1(b) show the difference in principle between Ducted and JetVent ventilation systems.
    Conventional ducted system
    Figure 1 (a).
    Conventional ducted ventilation system
    Impulse system
    Figure 1 (b).
    JetVent ventilation system
    JetVent or Impulse fan
    Figure 2.
    Workings of a JetVent fan
    Intelligent JetVent Fans
    Fantech offers a range of JetVent fans that feature advanced digital EC motor technology with integrated speed control. It allows precise control of every JetVent and the ability to implement a system that connects sensors directly to the fans.
    The revolutionary feature of this system is ComLink, the digital communication between JetVent fans, sensors and the pre-configured Fantech Aviator Controller. The result is a very simple control wiring scheme that is easy to install and commission, while providing a high level of energy efficiency and system monitoring. The Aviator controller will vary the operating speed of the fans and therefore the ventilation rate, according to the CO or NO2 pollutant levels in the car park.
    The JetVent fan speed is pre-set so it does not operate above the recommended noise level of 65dB(A) @ 8m (AS2107:2000).

    JetVent sensors

    Pollutant Monitoring
    The innovative Aviator controller monitors pollutant sensors connected to the system and adjusts the JetVent fan’s operating speed to meet the air quality requirements. Both Carbon Monoxide (CO) and Nitrogen Dioxide (NO2 ) sensors can be connected to the nearest main Aviator controller, Expansion Module, JetVent fan or Danfoss VLT Drive. These sensors are typically 4-20mA type or 0-10Vdc type and can be Modbus enabled.
    Temperature Monitoring
    The Aviator controller can also monitor temperature sensors connected to the system. if a hot area is identified within the car park such as near an air conditioning condenser. JetVents fans turn on when demand ventilation is required to reduce the temperature. These sensors are typically the 4-20mA or 0-10Vdc type and can be Modbus.
    Smoke Detection
    The Aviator control system can be activated to monitor Fantech smoke detection sensors. Duct probe smoke detectors can be fitted to the side of each JetVent fan and additional decentralised smoke detection sensors can be connected to the JetVent fans or Aviator controller as required. The Aviator controller can also be integrated into a third party smoke detection system if required.
    JetVent Fan Types
    JetVent Ancillaries
    Smoke Detection
    Fantech’s Aviator control system comes with optional integrated smoke detection. Smoke detectors can be fitted as duct probes to the side of each JetVent fan or installed as optional decentralised detectors that link to the JetVent fans, or controller via ComLink (RS485). Once the smoke detectors are installed, the Aviator controller will switch to smoke detection mode and continuously monitor the level of smoke in a car park.
    Aviator smoke detection operates as an early warning system should the event of a fire occur in the car park. The controller will display an alert on its graphic interface, activate warning alarms and flag the BMS if connected. The JetVent fans will turn off (0%) and the supply and exhaust fans will operate at full speed (100%) in compliance with AS1668.1. It can also be configured to suit local regulations or building designs if required. The Aviator controller will continue to monitor the activated smoke detector, and if cleared it will reset and return to normal car park ventilation mode.
    Note (A): Aviator smoke detection must NOT be connected to the Fire Detection Control Indication Equipment (FDCIE). This is an early detection and shutdown system to ensure the JetVent fans do not impact the operation of the installed fire detection and suppression system, and minimise the smoke conditions in the car park.
    Note (B): If a third party smoke detection system is used, the Aviator controller can be connected via its smoke detection input.
    Car park Smoke Detection
    Smoke detectors can be factory fitted to the JetVent fans and installed throughout the car park with a direct network connection to the JetVent. All smoke detectors are continuously monitored by the Aviator controller using Modbus RTU system communications and powered via the jet fan.
    Axial Flow Fans and Attenuators

    Fantech’s axial flow fans are available in an extensive range of sizes and variants to suit both supply or exhaust applications in car parks. They can be manufactured as vertical mount for riser installations and horizontal mount, typically used in plant rooms.

    They are available in 13 sizes extending from 315 to 2000mm diameter and can be fitted with matching rectangular or circular attenuators.

    • Casings are made of durable galvanised steel
    • Casings of stainless steel, other materials or special coatings can be supplied
    • Axial flow fans can be made with a specific impeller pitch angle to accurately meet the specification
    • Matching attenuators can be supplied to achieve superior noise reductions in car park applications

    Axial Flow Fans
and Attenuators
    System Layouts & Applications
    Assisted Natural Flow/Augmented Ducted System

    Where supply and exhaust air outlets are a large distance apart (more than 40m), there must be provisions to ensure air moves evenly across the width of the car park.

    JetVent Fans can be used to maintain constant air movement in these car parks to remove the effects of air stagnation and the resulting build up of pollutants. In large open car parks, JetVent Fans can be used to create a large pressure difference between supply and exhaust, hence boosting air flow in and out of the car park as shown below.

    Impulse system
    Assisted natural system
    Linear flow

    A linear flow system uses JetVent Fans pointing in the same general direction to move air from one end of a car park to the other. This system is similar to a traditional mechanically ducted system. The main difference is that the JetVent Fans direct air flow from a single supply point to a single exhaust point.

    For this scheme to work effectively, the exhaust and supply points should be located on opposing ends of the car park across its longest dimensions. If this is not the case, units arranged for circular mixing may be a better solution.

    JetVent Linear Flow System Linear flow system
    Circular mixing

    JetVent Fans can be positioned around the car park to generate air movement in a circular pattern. The result is that air gets mixed and stirred throughout the entire area, which provides greater dilution of pollutants within the car park. This system layout example shows the direction of air flow from supply to exhaust.

    Circular mixing is suitable for smaller car parks. This system also provides added flexibility when positioning supply and exhaust points. Unlike a linear flow system, a circular mixing system does not require exhaust and supply points to be on opposite sides of the car park.

    Impulse system Circular mixing system

    Elta Group