Also take into consideration duct positioning as many ceiling mounted fans are side ducted, so you will need to have enough space in the roof for the ducting to fit comfortably. If mounting your bathroom fan in a ceiling it is wise to check the location to ensure that there are no joists in the way and that the fan / vent is able to fit in between joists. So any window/wall exhaust fan should be positioned as high as possible. Positioning your bathroom fan high up (ceiling is ideal) means that the extraction system is able to capture steam as it rises to ceiling level. This means that your motor can be installed further away in the roof, you can even use an inline fan to create two intake points in the bathroom, particularly useful if its a very large room. If you would like to extract from a shower cubicle we recommend an inline fan setup. Secondly the steam that does escape the shower area will linger in the rest of the room for longer. firstly if condensation forms on the face of the fan / vent, it may cause dripping. We do not recommend placing the extraction fan directly above or within a shower cubicle for a few reasons. This means the best position for your bathroom fan would be in the room roughly opposite the entrance door. Alternatively it could be a window that is slightly open, however this may not be ideal in the winter months. Typically fresh air can enter the room via a gap under the door, the typical recommendation is a 20mm gap. This means that you have a source of fresh air entering the room as well as your moisture laden air being able to leave the room. It is important to aim to achieve a cross flow of ventilation in your bathroom. This means we can look for a solution that provides an extraction rate in the vicinity of 225 m3/hr USE OUR EXHAUST FAN CALCULATOR Fanco Bathroom Exhaust Fan Options If we multiply this by 15 (air changes) we get a figure of 225. So for a 3m x 2m x 2.5m bathroom, the m3 size would end up being 15m3. Overall room size x desired number of air changes per hour (for a bathroom with a shower we usually recommend 15 – 30 air changes) Length x Width x Height = Overall room size in m3 The usual calculation for a bathroom with a shower is as follows: A larger bathroom will typically require a fan with a higher extraction rate. This measurement denotes how much air the unit can extract, or how powerful the fan is. Determine Extraction RateĮach exhaust fan has an extraction rate (usually measured in cubic meters per hour). In this guide we will explore the different options youhave to ventilate a bathroom with practical examples for each. Welcome to our ultimate guide to bathroom exhaust fans.
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