Inline Extractor Fan with Directional PIR ?

[flutterbye]

Hi

After reading too much about fans, I've come to the conclusion that ideally, I would want an inline fan in the ceiling that comes on when someone walks in a certain part of the room (enters the shower cubicle). Is such a thing possible? Maybe I'd just need to tape up part of the PIR sensor although not sure if that would pass the wife's aesthetic test !

Could anyone recommend a good inline fan and suitable PIR?

Thanks in advance!

 

[GarethW]

What your after is an occupancy or proximity detector

 

[ban-all-sheds]

I would want an inline fan in the ceiling that comes on when someone walks in a certain part of the room (enters the shower cubicle).

But what if they haven't gone into the cubicle to have a shower?

Would you want the fan to come on then?

Why not have it triggered by actual use of the shower?

 

[bernardgreen]

A thermstat that closes on rise of temperature set at about 40 deg C on the hot supply pipe to the shower will switch the fan on when the shower is used. It also keeps the fan running after the shower is turned off until the water in the supply pipe cools down.

With due care about electrical safety one of these has been used.

http://www.alliedelec.com/Images/Pr...TANCOR/Stancor_Industrial-Control_9286056.pdf

I think for a DIY project a tank thermostat with a change over contact will do the job.

 

[ban-all-sheds]

A thermstat that closes on rise of temperature set at about 40 deg C on the hot supply pipe to the shower will switch the fan on when the shower is used. It also keeps the fan running after the shower is turned off until the water in the supply pipe cools down.

Assuming it's a mixer shower, and not an electric one...

Otherwise a good idea - easier to install than a flow switch, particularly if retrofitting.

If it is an electric shower, the fan could be triggered by the isolation switch, or a flow switch in the cold supply.

With due care about electrical safety one of these has been used.

http://www.alliedelec.com/Images/Pr...tancor_Industrial-Control_9286056.pdf[/QUOTE]
Presumably you can get thermostats designed to attach to pipes?