Fit timer to existing extractor fan

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Have the extractor in the loft space above the bathroom, venting to outside. It of course has the isolator outside, next to the light switch as it happens. The two are not interconnected.

How would I go about fitting a timer to the fan to have it run for say, 10mins after the switch is switched off? I don't wish it to be related to the light being on or off at all.

Thanks
 
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Easy option is a pneumatic switch 1665829587100.png but there are so many other options hard to know where to stop. I use smart relays for lights, and there are also 1665829700019.pngelectronic switches, some require a neutral, seem to remember time should be 15 minutes.
 
Easy option is a pneumatic switch View attachment 282640 but there are so many other options hard to know where to stop. I use smart relays for lights, and there are also View attachment 282641electronic switches, some require a neutral, seem to remember time should be 15 minutes.
Thanks for the reply.
Those pneumatic switches are awful. I have them in the hallway and stairs of a property that I let and they are forever sticking. I get about 5yrs out of one before it sticks entirely and has to be replaced.
 
I use smart devices to control lights etc, and voice control, as said many ways to do it, but to suggest Nest Mini, relays, and zigbee is really using a sledge hammer to crack a nut.

Because my wife likes walking around the house telling google what to do, does not means that's everyone's cup of tea. At least she is not telling me what to do. And it gives me an excuse to ignore her, "Sorry love thought you were talking to google" gets me out of many jobs.
 
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That looks spot on! Thank you.
Any idea how I would use it? Presumably I could sit it in the loft next to the fan, set the timer and leave it. The presumably, I use the on/off isolator switch as normal and when switched off it simply over-runs as per the timer setting?
Yes. You’ll need L, SL & N to the timer unit, of course.
 

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