Extractor fan with timer

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Jethro Tull

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Does a timed extractor fan always have to be linked to the light switch? I need to fit an extarctor fan in the toilet which has a non opening window so the light won't need to be switched on. I would like it on a timer incase it gets left on, but obviously when I pull the seperate pull chord/switch it will isolate the fan unit. Any way around this?
 
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when you say timed fan. Usually this means it will run on for a period after the light has been turned off. e.g 2 minutes to 10 minutes to remove smells or steam

does the room have a bath or shower?
 
Yes that's what I thought, they usually connect to the lights but they won't get switched on because there is plenty of light already. Yes it has a shower unit. Thanks
 
well people need to turn it on anyway.

They would need to pull a fan chord anyway?

I would recommend a fan with humidity stat. This will cause the fan to run after a shower to remove steam.
Though it helps to turn the light on to start with to get it going
 
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You could fit a separate pull cord that will activate the fan independent of the light.
 
Last edited:
Yes.

You would run a 2 core+earth cable consisting of perm LIVE and NEUTRAL to another new pull switch.

From this new pull switch run a 3 core+earth cable to the fan.

At the new pull switch connect the two neutrals to a separate connector block.

At the new pull switch connect the permanent live feed supply wire and the permanent live of the fan to one side of the switch.

At the pull new switch connect the switched live (or trigger) wire of the fan to the other side of the switch.

It is worth noting this arrangement will not completely isolate the fan for things like maintenance, so if this is a problem you would fit a 3 pole switch in-line of the fan cable - and keep that switched on.
 
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Presumably if the timer was set to a high amount of minutes, one could turn the pull cord on, then immediately off (before one has time to forget later), thus allowing the fan to operate for enough time for a shower, and some run on time afterwards.
 
These are the options as I see it.

1) Momentary pull cord. (the red one) Ideal if you always want the same fan on time.
2) A 16A pull switch with neon light. It is then easy to see if you intend the fan to be on or off.
3) A humidity stat fan can be added to the above options.

However, how ever simple or cleaver the options get, just connecting it to the light is always the best allround tidy and simple solution
 
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