![]() ![]() A duct passing through an unheated roof should be insulated to reduce condensation and when using a vertical duct, a condensation trap must be fitted to release the build-up of condensation.īe careful where you install the fan, because some zones in the bathroom are usually more moist than others and you should follow the regulations concerning extractor fans in the bathroom. The duct should not be too long and should be as straight as possible and must never be smaller than the fan spigot or squeezed into the spigot, as this will restrict airflow. When installing a fan, install it as far as possible from inlet/outlet grilles to prevent vibration from being transferred to the grilles, causing noise. Some fans can be installed in the loft to make it extra quiet. Noise can really be a problem over time, so it pays to have a quiet fan installed. Centrifugal extractor fans uses drum type blades that processes less air volumes than axial fans, but handles more pressure. An extractor fan with this capacity is what you would need for the job.Īxial flow fans use a propeller type blade, which are very efficient in extracting large volumes of air. This will give you the cubic metres per hour air change requirement. Multiply the recommended air changes - for instance 15 to 20 times per hour for a bathroom with shower - by the bathroom volume. To determine which type of fan you would need the room must be measured by multiplying the length by the width by the height to get the volume of the room. The smaller the fan the harder it has to work and the noisier it gets, so for a bathroom with a big fixture, such as a spa, you should use an appropriate fan. The switches differ on the various models from a single switch to turn on the fan and light at the same time to switches for each function separately. Then there is the option of fan/heat/light that combines the three fixtures. It's important to choose the correct fan from the start, with proper air movement capacity and silent operation, You can also use a combination of fan and light with a heat bulb or two, or alternatively a fluorescent light with the fan. There are also electrical connections that may be badly affected by constant moist conditions in the loft. ![]() According to the Building Code, extracted air must be directed to the outside. Air should be vented all the way to the outside, because it would serve no purpose if the moist air is vented into the loft. The fan should be placed as close as possible to the source of moisture or odour. A timer switch is very handy for letting the fan work for a pre-set period after you used the bathroom, or you could install a fan with a humidistat that will do this automatically. After a shower the fan should run another five minutes or more. Without airflow into the bathroom the effectiveness of the fan will be reduced to a fraction of what it should be. The door or window should be opened a little to enable the extractor fan to draw fresh air into the bathroom and replace the moist air. It should be kept in good condition, considering the conditions under which an extractor fan in a bathroom has to operate. It removes excess moisture and thereby reduces mould and mildew and removes bad odours, keeping the air healthy. One of the best fixtures a bathroom can have is an extractor fan. Choosing, Installing and Maintaining a Bathroom Extractor Fan ![]()
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