Bathroom ventilation is often poor, leading to condensation and causing mould to grow. Most bathrooms needs a bathroom fan to get the air circulating.
Bathroom ventilation
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Ideally, bathroom ventilation should be via an electrically operated bathroom fan venting to the outside. These bathroom fans are usually connected to the light switch so that when the light is switched on, the fan starts and runs for about 15 minutes after the light is switched off. Because of this, it is best to plan and install the bathroom ventilation system while the bathroom lighting is being renewed.
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In the majority of bathrooms, there are windows which allow for natural ventilation, however where there is no bathroom ventilation, a bathroom fan should be installed to ensure a good bathroom ventilation system. Even if your bathroom has windows, you may still need to get a bathroom fan to ventilate your bathroom adequately.
Bathroom fan size
You can calculate the size of extractor fan you need for your room by calculating the volume of the room.
Multiply the room's height by its width by its length. Then multiply this figure by the number of air changes needed in an hour (20 for bathroom, 15 for WC). This gives you the flow rate required for the bathroom fan, so when looking for a fan, buy a bathroom fan with the appropriate flow rate for the best bathroom ventilation.
Bathroom fan flow rate = Room volume (Height X Width X Length)X 20
WC fan flow rate = Room volume (Height X Width X Length) X 15
It is essential that your bathroom ventilation is good so plan this into any bathroom design and ensure you get the right bathroom fan size.