W/C Extractor - Building Control

[St0rmer66]

Tried a search but can't seem to find anything specific to my query.

I have had an extension built which has yet to be signed off by Building Control. Part of it is a downstairs toilet with basin. There is no openable window. Clearly some sort of vent or extractor will be required but I'm wondering if the PIV I have on the landing (Nuaire Drimaster) of the existing part of the house will allow just a passive vent rather than a mechanical extractor? Makes sense to me in my head but sometimes regulations don't allow common sense approach!

Thanks in advance.

 

[pilsbury]

Got a feeling you'll need an extractor in the bog.

 

[John D v2.0]

Yeah you need mechanical extraction unless you have something very fancy like a passive stack, off hand it's about 8l per second boost rate but a normal cheap 100mm extractor would be fine for BC. If you want something quieter you can get a ball bearing 125mm or bigger fan. Some Mount inline if you want to duct it and keep it in the roof space if any.

 

[pilsbury]

Can I hi-jack and ask if you can have an extractor in the toilet venting into the garage?

 

[St0rmer66]

Had a feeling I'd need one but wanted to see if there was a way around it! Does it have to come on with the light or can it be independent?

 

[John D v2.0]

Had a feeling I'd need one but wanted to see if there was a way around it! Does it have to come on with the light or can it be independent?

Can be independent but you're not supposed to have a humidistat or anything due to the pollutant being odour. You'd probably be best with a fan with a low trickle rate, then even if someone doesn't switch it on, it will not smell stale later...

 

[John D v2.0]

Can I hi-jack and ask if you can have an extractor in the toilet venting into the garage?

No, well you're supposed to extract to outside air, anyway you don't want warm damp air venting into your garage in winter really.

 

[St0rmer66]

Can be independent but you're not supposed to have a humidistat or anything due to the pollutant being odour. You'd probably be best with a fan with a low trickle rate, then even if someone doesn't switch it on, it will not smell stale later...

Just to confirm, do you mean a fan that runs constantly very slowly but with a boost?

 

[John D v2.0]

Yes exactly that. Then it'll be quiet but always fresh in there. But it's overkill if you just wan't to get signed off at minimal cost.I just dislike fan noise, but in a toilet it can be good to drown out other noise

 

[St0rmer66]

It definitely needs some ventilation, it's very humid in there even though it's had minimal use so far! I like the idea of it running constantly. Is it just the heat recovery type that do that?

 

[John D v2.0]

No you can get normal ones with trickle, for example
http://www.screwfix.com/p/vent-axia-solo-plus-t-centrifugal-bathroom-extractor-fan-with-timer/94274