Exhaust Fan Calculator

This page is designed to be a general guide for selecting an exhaust fan based on the size of the room and the type of application the fan will be used for. All you need to do is select the application from the dropdown, enter the size of the room and we will provide you with a general capacity range (m3/hr) that you should be looking to achieve from the extraction fan.

Important Notice – Please Read before you begin: This information is intended to be a guide only. It does not constitute specific advice. This calculator is designed to be a tool to assist in calculating the theoretical capacity required for a room based on room size and suggested rate of changes per hour ONLY.
It does not by itself provide a ventilation solution for a particular area. The suggested rate of changes per hour is based on the Australian Building Codes as a guideline, and also takes into account reasonable and standard situations and expectations.
Please keep in mind that other factors may contribute to achieving a desired ventilation solution, which can include but is not limited to: the client’s expectation of how quickly steam/smell should be removed from a room, the climate, the materials in the room (eg tiles, windows etc), whether there is dampness or excessive humidity issues, whether enough air is coming in, whether there is good cross ventilation, if the fan is ducted, how the ducting system including the type of vents is set up, the type of motor if an inline fan is used and whether it is the correct type of motor for the set-up.
We strongly encourage our customers to contact our knowledgeable staff if you need any assistance with your purchase.


Best Selling Ceiling Exhaust Fans

  • Capacity: 264 m3/hr (73.33 l/s)
    Hole (Cutout) Size: 150mm Round
    Face Size: 206mm Square
    Ductable: Yes (150mm duct diameter)
    View full technical specs further down the page


    The Chico range features a modern design with a capable exhaust fan. It is a ductable ceiling or wall mounted exhaust fan with a very modern low profile fascia, which makes it popular with interior designers and architects.


    Need Accessories? – Scroll to the bottom of the page to view suitable accessories including ducting and vents.
    $179.00 $109.00
  • Capacity: 320 m3/hr (89 l/s)
    Hole (Cutout) Size: 290mm Round
    Face Size: 325mm Round
    Ductable: Yes (150mm duct diameter)
    View full technical specs further down the page


    The Luna PRO is a high capacity ceiling mounted exhaust fan that comes with an ultra modern low profile cover.


    This fan is side ducted and comes with a built in backdraft shutter.


    Need Accessories? – Scroll to the bottom of the page to view suitable accessories including ducting and vents.
    $119.00 $99.00
  • Capacity: 320 m3/hr (89 l/s)
    Hole (Cutout) Size: 290mm Round
    Face Size: 325mm Square
    Motor Height: 194mm
    Ductable: Yes (150mm duct diameter)
    View full technical specs further down the page


    The Metro PRO is a high capacity ceiling mounted exhaust fan that comes with an ultra modern low profile cover.


    This fan is side ducted and comes with a built in backdraft shutter.


    Need Accessories? – Scroll to the bottom of the page to view suitable accessories including ducting and vents.
    $119.00 $99.00
  • Capacity: 550 m3/hr (153 l/s)
    Hole (Cutout) Size: 296mm Round
    Face Size: 326mm x 326mm Square
    Ductable: Yes (150mm duct diameter)
    View full technical specs further down the page


    The Ventair Airbus 300 is a low profile, side ducted exhaust fan available in with a round or square fascia. This fan comes with a high quality ball bearing motor. It also includes a backdraft shutter and lead and plug for easy installation. The Airbus has been designed for longer duct runs, for more information please refer to the pressure curve below.


    Need Accessories? – Scroll to the bottom of the page to view suitable accessories including ducting and vents.
    $175.00 $152.00

Best Selling Wall Exhaust Fans

  • Capacity: 264 m3/hr (73.33 l/s)
    Hole (Cutout) Size: 150mm Round
    Face Size: 206mm Square
    Ductable: Yes (150mm duct diameter)
    View full technical specs further down the page


    The Chico range features a modern design with a capable exhaust fan. It is a ductable ceiling or wall mounted exhaust fan with a very modern low profile fascia, which makes it popular with interior designers and architects.


    Need Accessories? – Scroll to the bottom of the page to view suitable accessories including ducting and vents.
    $179.00 $109.00
  • Capacity: 360 m3/hr (100 l/s)
    Hole (Cutout) Size: 170mm – 210mm Round
    Face Size: 245mm Square
    Ductable: No
    View full technical specs further down the page


    The Maxair exhaust wall fan features electric shutters to prevent back drafts. This product is supplied with an external grille and duct to join. Please note that auto-shutters will take approximately 30 seconds to open and close.


    Need Accessories? – Scroll to the bottom of the page to view suitable accessories.
    $310.00
  • Capacity: 315 m3/hr (87.5 l/s)
    Hole (Cutout) Size: 155mm Round
    Face Size: 214mm Square
    Ductable: Yes (150mm duct diameter)
    View full technical specs further down the page


    The Quiet 150 is a ceiling or wall mounted exhaust fan which has been specifically engineered to operate quietly. The unit has a capacity of 315m3/hr, it is a two speed motor and on the low speed the unit has a capacity of 220m3/hr. The desired capacity is achieved by wiring the fan to the relevant speed setting. This fan is relatively unique as it has anti vibration technology which helps to further reduce noise generated from the motor.


    Need Accessories? – Scroll to the bottom of the page to view suitable accessories including ducting and vents.
    $249.00 $159.00
  • Capacity: 292 m3/hr (81.11 l/s)
    Hole (Cutout) Size: 150mm Round
    Face Size: 205mm Square
    Ductable: Yes (150mm duct diameter)
    View full technical specs further down the page


    The S Series exhaust fan model is a compact yet capable exhaust fan featuring a simple design. Suitable for small sized household bathrooms and laundries as the fan has a capacity of 293 m3/hr and comes with a fly screen which is easily removed.


    Need Accessories? – Scroll to the bottom of the page to view suitable accessories including ducting and vents.
    $115.00 $69.00

Location Air Changes per hour
Bathroom (toilet only) 6 – 15
Bathroom with a shower 15 – 25
Bedroom 5 – 8
Cafe 15 – 25
Computer Room 6 – 10
Factory / Workshop 6 – 10
Garage 6 – 8
Commercial Kitchen 20 – 30
Domestic Kitchen 15 – 25
Laundry(No Dryer) 6 – 15
Laundry(With Dryer) 15 – 25
Commercial Laundry 11 – 20
Office 4 – 6
Sub Floor 6 – 10
Spa Bathroom 15 – 25

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