I'm looking to fit an extractor fan in my small bathroom. I'm hoping it can be ducted through the loft and down and out through the soffit. I'd like to fit it in the ceiling above the shower (it's not a shower cubicle, just an 'over bath' shower with a bath screen) and would like one that comes on when it gets humid, and stays on after I've left the bathroom, until the humidity has died down. I assume I need an 'inline' or shower fan, but I can't seem to find one that has the humidity function. Can anyone suggest a suitable fan? Many thanks
Manrose, Expelair and Ventaxia make humidity controlled fans. Alternatively you could just fit one that is activated by the light switch and runs on for 20 minutes after the light is turned off. Alternatively use one of the latter but use a separate humidistat to operate it in place of the light.
Remember that a bathroom is a special location under Part P of the building regs when you are considering your electrics.
Silavent make a low voltage extractor fan with timer and humidistat, it also has a heat exchanger to help save some of that heat.
Look for a fan that has an effective shutter that will keep out the cold.
Also note an open fan will loose an enormous amount of heat.