Hello,

A bathroom with no windows and a fan which is on/off with the lights. No timed over run. This is a let flat.

The council have demanded that it be changed for one with a timed over run. Getting to a permanent live in concrete ceilings is not going to be easy.

I can't find the requirement for timed over run in building regs or big red. Do you know where it is? And if you do, could you point me at it?

I'll do the work anyway but my inner geek is telling me to know more.

Thank you.

Zs

AFAIK the building regs require suitable ventilation in a bathroom or toilet without an opening window.
I dont think that the regs specificly state that an overrun is required, but it could be argued that a fan that stops as soon as the room is vacated is not "suitable"

Not in BS7671.

Lol.........I thought the timer was just an extra to get rid of extra smelly no2's

Zs

If you can alter the wiring so that you have a continous live at the fan position, how about using a fan with an integral PIR? These have an over-run facility. So far as I remember, Silavent make one and so do Manrose.

This will then solve your problems with the rewiring. No wiring changes as such.

Regards

Mike

Zs I installed a fan in the house recently.

Snags and Solutions was pretty useful as it referenced lots of details from various sources.

As far as I can remember the main thing is a local point of isolation i.e. 3-pole isolator switch.

Part F of the building regs is what you are after.

References to 15 minute overrun include the crucial word 'should' and appears in the 'new dwelling' section. I'm not aware of any part of the approved doc that apply to existing buildings unless new work is being carried out.


If you lose the argument however, you may be able to overcome the concrete ceiling problem (I need 36V of SDS to even get fixings in the ones I work in locally!!) by installing a PIR or humidity fan on the existing T+E and re-wiring it to a permanent feed at the light fitting.

Zs

Part F of the Building Regs.

See http://www.planningportal.gov....cuments/partf/approved

-------------------------
John Peckham

http://www.astutetechnicalservices.co.uk/

You could fit an extermal timer unit? They usually come fixed to a single blank plate with a variac sticking through to adjust the time. This can then be situated next to the switch, or somewhere that suits.

-------------------------
Regard
Richard (Dick)

www.rllewellyn.co.uk

i believe a fan with a humidistat is also acceptable. Just change the supply to it to mains. Gary

-------------------------
Specialised Subject. The Bleedin Obvious. John Cleese

I guess it depends on if the bathroom also contains a WC - the dominant condition then is control of odours so a humidistat is a bit ineffective.

Part F does mention this

Regards

OMS

-------------------------
Failure is always an option

"so a humidistat is a bit ineffective."

It would depend on weather (sic) it is eye wateringly (sic) bad

Regards

BAD

Are you saying it would not comply oms ? bearing in mind a w/c with an opening window does not require an extractor, or has that changed.

Gary

-------------------------
Specialised Subject. The Bleedin Obvious. John Cleese

How about this remote timer from Telco? http://www.tlc-direct.co.uk/Products/BGDT20.html

Cheers
Chris

We are discussing enclosed spaces I believe. Try a read through Clause 4.20 of Approved Document F 2010 or Table 1.5 in AD F 2006 where bathrooms are also sanitary accomadation

Regards

OMS

-------------------------
Failure is always an option

Or an air quality switch? - e.g. http://www.justfans.co.uk/air-...ity-sensor-p-238.html
- Andy.

Cheers.

100 lines for me.

I must read the OP properly.

i missed the no window bit.

Gary

-------------------------
Specialised Subject. The Bleedin Obvious. John Cleese

Don't forget that a fan in a bathroom with no window requires it's own isolator. Turning off the MCB to the lighting curcuit removes light in the room.

What about fusing the fan inacordance with manufacturer's instructions.

We never have a tourch to hand do we.........

And for the fan in a bathroom .......... with a window?

Regards

Just zap em!.........

-------------------------
Those who make no mistakes do very little work!!......