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.


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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