Neat ideas for Toilet Ventilation - Motion Detection

[Chris Langridge <chrisl@xxxxxxx>]

There's a motion detection question at the end of this...

I wonder if we've ever had a thread about PanFans or Ventalus? Both of thes= e
systems draw odours directly from the toilet bowl. A friend has a Ventalu and swears by it - however they are a bit pricy at =A3300 per install - als= o
they require a special ducted seat. The PanFan appeals more becuase it is simply an inline fan which can be retrofitted into existing insatallations.=
It works by drawing air through overflow passage. The PanFan, which is
cheap, is also an obvious candidate for incorporation into a HA control
system like HV.

PanFan do sell an IR sensor to go with their kit. It detects presence in th= e
'vicinity of the toilet area' and kicks the fan on. I'll find out the price=
of this controller tomorrow - but I was thinking that HV might do a more reliable and flexible job using a more 'standard' motion detector.

So the question is:
What kind of detection system is likely to be most effective. It has to be<= BR> near the toilet bowl, otherwise the fan will go on when someone is brushing=
their hair, or having a bath. I have two rooms I wanna use this for - a WC<= BR> only downstairs and a bathroom upstairs.

A pressure switch in the loo seat was one idea - but I suspect that this will be unhygenic.

As the cystern in both rooms is boxed in with stud work, I would have thoug= h
that a PIR sensor set low in this stud work may work nicely. It needs to detect the back of one's calf at close range (ie when you're sitting on the=
john), and ignore people in the rest of the bath room.

The other option might be some kind of beam break system like you see in Mission Impossible.

Any ideas?


Chris


http://www.wave.co.nz/~p= anfan/case.htm
http://www.ventalu.co.uk/ind= ex.htm

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