Bathroom Exhaust Fans are Hugely Important....
Can't I just Open a Window to Ventilate my Bathroom?
How to Pick the Appropriate Exhaust Fan:The primary concern is to ensure the fan is appropriately sized for your room. A tiny little toilet will require a much smaller capacity fan than a multi cubicle bathroom for example. The basic steps required in picking out the correct exhaust fan are:
- Determine what variant of exhaust is required and how it will be mounted (eg wall, ceiling, window etc)
Calculate the area being exhausted in meters (Length x Width x Height). This will give you a figure in m3 (cubic meters).
- Multiply this with the number of air-changes required (8 for a subfloor/meeting area, 13-15 for a bathroom/toilet, 15+ for smoke exhaust). If you like to have long, hot showers or are concerned about steaming up the bathroom then please use a figure of 20 – 30 air changes per hour.
- Determine whether to duct directly into the roof space, duct out through the roof or through a wall/eve. Most exhaust fans are ductable and in an ideal world you would have all exhausted air going straight outside via an external wall vent or roof cowl for example.