Nobody has any idea if there is, or is not.
As the old fan has now been thrown away, and all that's left is a cable coming out of the wall, how can you say that there isn't a transformer somewhere?
Manrose fan connection
- Thread starter Emmalenkhe
- Start date
As the old fan has now been thrown away, and all that's left is a cable coming out of the wall, how can you say that there isn't a transformer somewhere?
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I am not saying that at all. (Read the quote again.) I am saying if the fan wasn't 230/240V (and therefore 12V typically) then I would expect there to be a 12V transformer somewhere.
See what I mean?
As this bathroom does not have an opening window, then Building Regulations require a fan with an over-run.
The Approved Document mentions it, but all the Building Regulations actually require is adequate ventilation.
But even if the overrun is taken as needed, what does that have to do with why linking to the light switch has become so common in Britain in more recent years?
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I suppose it's the only way of ensuring that the fan comes on (and 'overruns') at least some times. In the case of 'no window' (rather than 'no openable window'), the light would presumably have to be switched on whenever the room was used.
The silly (but unavoidable) problem is, of course, that having an 'openable window' precludes the need for mechanical ventilation, even though there is no way of requiring the window to actually ever be opened!
Kind Regards, John
Until, as I mentioned earlier, somebody gets so fed up with the fan running for 15 minutes or so every time he switches the light on to use the facilities for a moment during the night that he just disconnects the fan altogether so then it never gets used. I really do feel that trying to force the use of the fan by way of the light is counter-productive.
Then there's the converse situation in which if somebody wants to keep the fan running for half an hour, he needs to turn the light on even if it's broad daylight and there's light streaming in through the window. Isn't there a movement in full swing at the moment about not wasting energy? Forcing people to have the lights on just to use the fan doesn't seem a particularly good way to go about saving energy. I suppose with a timer fan one could just blip the light on and off for a second every few minutes to keep the fan going, but that seems to be making things unnecessarily awkward (especially if the timer has been set down to 4 or 5 minutes, as is quite likely, since even if some people might not go so far as disconnecting the fan, they often find the 15 minutes or more overrun excessive and adjust it to a shorter period).
Just goes to show the silliness of the whole thing.
A typical bathroom fan will run for about 50 hours on one unit of electricity costing 11p.
Some more modern ones will run for about 100 hours.
Paul may have been at least partially thinking about all the (expensively heated) air being pumped out of the house, rather than just the cost of running the fan!
... and where does one find this 11p/unit electricity?
Kind Regards, John
I find mine on my electricity bill. Where do you find yours?
31 Oct 15
per kWh
10.35p
+5% VAT
= 10.8675p, to be precise.
I find mine the same place you do, but since I have an E7 tariff, that wouldn't help much. I must be behind the times - people usually seem to quote figures in the range 14-16p per kWh, so I assumed that was the current 'going rate' for single tariffs.
Kind Regards, John
That's a good point, although my comment was directed toward the converse situation of leaving the lights on in order to have the fan running. That could be a couple of hundred watts or more of lighting burning away to use a 20W fan.
That's not far off what we're paying here at the moment; our rate is currently 15.9 cents per unit, which at the current exchange rate works out to about 10.6p. equivalent.
Fair enough - but you probably need to refer that case of a "couple of hundred watts" to light a bathroom to BAS, 'for comment'
Kind Regards, John
Energy costs have dropped over the last 18 months. Oil price has halved due to fracking in the US turning them from an importer to a net exporter, and OPEC (especially Saudi) still pumping it out to cause a glut and drive competitors bankrupt. Mr Putin and the Scottish fish people are having a hard time.
Well, we have 240W in our main bathroom here at the moment. But don't worry, it's not downlighters - I don't like those either!you probably need to refer that case of a "couple of hundred watts" to light a bathroom to BAS, 'for comment'
No - you did not say "if... then...", you said "chances are...", i.e. you were asserting that it is more likely than not that is is a 230/240V fan.
I'll rephrase my question.
How can you say that there is a less than 0.5 probability (or less than 0.x, whatever you regard as the threshold for 1-0.x to be "chances are") that there is no transformer just because one has not been found, given that no search for one has been undertaken?
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