Bathroom window open with extractor fan on?

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Could anyone tell me whether an extractor fan will work more effectively with bathroom window open or closed? (I don't want to use more electricity than necessary, and also want to clear the post-shower moisture from the room as soon as possible. I realise these two aims may not be possible to achieve simultaneously!)
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I'd forget the electricity though, little fans only use a few tens of watts and the difference will be minimal, fractions of a penny per hour.
Same here and it is a noticeable difference to having just the extractor.
I agree. My bathroom window stays open a lot of the time.
It's all down to where the extractor is in relation to the window.
If you have a 10 ft long bathroom with the window 3 or 4 feet from the fan, what's going to happen?
The air will be pulled from the window and take a shortcut or short circuit up the extractor, Air at the far end doesn't get changed.
I can quote my own situation, bathroom 15 ft long and mostly quite narrow. Extractor over shower, only window is to the side about 5ft away. Opening window doesn't work, the mirror at the other end over the sink will not clear.
The answer in my case is either to shut the window and interestingly watch the air being drawn down from around the flush mounted ceiling lights, (the mist swirls below, you can see what's happening). Or, open the door which is at the far end from the shower, this clears the room fastest, but I do that dependant on season.
Will the grammar and spelling police respect I do make grammatical errors, and have carp spelling, no need to remind me.;)
Always expect the unexpected:eek:and then you won't be dissapointed
If I leave the job to my extractor fan, it'll take all day. In fact, using the window alone is far better at clearing the moisture than anything else.
Our extractor is wired into the light, so it's not really possible to not use it, but I always use the window to speed up the process.