DG37

Roof Mounted Turbo Ventilators

Roof mounted ventilators are often used to assist in ventilating spaces, whether it is a room or roof ceiling void.

The location and design of the roof ventilator needs to be carefully considered to ensure that it provides the maximum benefit to the design.

Design and installation should be in accordance with the manufacturer’s recommendation.

ID
Title
Compliance Level
Expand All
37.01
Required Air Changes
Mandatory
Mandatory
  • The size and number of ventilators to be included will depend upon the volume and use of the individual rooms and the local climatic conditions to provide suitable air changes and room cross ventilation.
  • Provide a minimum of two roof ventilators to each Secondary General Learning Space or a Primary Home Base unless otherwise directed, or other number recommended by the manufacturer for the size of the space (whichever is  the greater).
  • Ventilator throat diameter to be no less than 400mm. 
37.02
Ventilator Location
Mandatory
Mandatory
  • Close coordination is required with the ceiling structure, luminaires and ceiling fans.
  • Consider aesthetics - Take into account uniformity of spacing both within and external to the building, and the size selected.  A larger size may be required for satisfactory visual effect unless otherwise directed or specified.
  • Mount ventilators at high points of roofs (eg. ridges) to avoid hot air being trapped in the peak of the roof space.
  • Likewise, locate ceiling grilles at high points of the ceiling and away from make up air.
37.03
Flashings
Mandatory
Mandatory
  • For slope mounted units, flashing should extend all the way from the ridge-piece to the turbo. 
  • Ridge-mounted units are recommended by manufacturers to reduce this flashing.
37.04
Space Ventilation
Mandatory
Mandatory

When roof mounted ventilators are used to provide space ventilation:

  • Grilles and roof structure must give minimum air resistance
  • Dampers will be required to limit heat loss and control in winter. Install electric powered dampers with controls marked open summer & closed winter
  • The effectiveness of ventilators relies on an intake of relatively cool air into the room
  • In canteens, roof mounted turbo-ventilators are recommended to ventilate the roof space. Ceiling grilles are not permitted
37.05
Ventilators In Corrosive Environments
Mandatory
Mandatory
  • Turbo-ventilators must be certified by the manufacturer for use in coastal and corrosive environments (ie marine grade aluminium and stainless steel) in schools located within 3km of the ocean, 1km from bays or in highly industrialised areas with corrosive atmospheres.
Home > Design Guide > Openings > Roof Mounted Turbo Ventilators