RE: Neat ideas for Toilet Ventilation - Motion Detection

["Kevin Hawkins" <lists@xxxxxxx>]

    I think there is one made 'just for the for the job' ;)

 

    - The large toilet facilities in airports say use IR sensors to provide all their flushing, urinals and WC's - I think these work on more of a constant heat proximity than movement and a target has to be present for a while. Actually when I was coming back through Schipol a few weeks ago I was amusing myself trying to see if I could get them to trip repeatedly like a standard PIR with no luck - sad... very sad.. I assume the Panfan things are similar....

 

   Very appropriate use for a motion detector ;)

 

    K

 

   

-----Original Message-----
From: Shane Harrison [mailto:shane.harrison@xxxxxxx]
Sent: 15 September 2002 11:37
To: ukha_d@xxxxxxxSubject: RE: [ukha_d] Neat ideas for Toilet Ventilation - Motion Detection

Hi Chris,

I visited a house here in NZ recently that had Panfan's installed - I am
sold on them and will be using them in our house to be built.

Anyway - I don't have any other ideas re. the detection, but I can tell
you about the panfan setup I saw.  First it was reliable in terms of
detection.  The sensors which I assume were narrow beam PIR's or
ultrasonic detectors were mounted about stomach height when seated on
the throne.  In all cases the WC was in close proximity to a wall
perpendicular to the rear of the WC - if you get what I mean.  Unless
the panfan detectors are really overpriced I imagine you wouldn't get
much milage out of an HV solution unless you were keen to monitor how
often the facility was used or when it was in use :-)

Shane

> -----Original Message-----
> From: Chris Langridge [mailto:chrisl@xxxxxxx]
> Sent: Sunday, 15 September 2002 7:08 p.m.
> To: 'ukha_d@xxxxxxx'
> Subject: [ukha_d] Neat ideas for Toilet Ventilation - Motion Detection
>
>
> 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 these systems draw odours directly from the
> toilet bowl. A friend has a Ventalu and swears by it -
> however they are a bit pricy at £300 per install - also 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 the '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 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 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 though 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/~panfan/case.htm
http://www.ventalu.co.uk/index.htm


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