• Welcome to the new forum. We're now hosted on ElectriciansForums.net rather than ElectriciansForums.co.uk - Chat about the forum upgrade by CLICKING HERE

Welcome to our Electrical Forum - We started out providing electrical advice just for the UK - But now we have specific advice for the USA too! - Register for free and share American Electrical Advice.

Discuss Cloakroom Extractor Fan in the Electrical Forum area at ElectriciansForums.net

TicTax

New EF Member
Hi All,

I'm installing a new extractor fan in my downstairs loo. The wall that the fan will be mounted to backs on to my garage and the ducting runs in to there before turning 90 degrees and exiting through the roof. This is a ducting run of around 4m.

Given that the downstairs loo is just that and doesn't contain a shower, it'll never be humid. Therefore, with a ducting run that long, can I install an axial fan or does it have to be centrifugal? I'd prefer axial because frankly they're less of an eye-sore.

Thanks in advance for any and all help,
Robin.
 

Bellendian

Regular EF Member
Building regs don't specify extraction for a wc alone, so I'd suggest that you can do what you like. If you want it to be effective then try to use rigid ducting rather than flexi as it results in lower losses since it's smooth.
 

pirate

Regular EF Member
I had exactly this problem when my new cloakroom was installed. Builder said I must have a fan, and it is internal, no window. he installed the cheapest, flush fitting fan, and the ducting runs down the cavity wall, under the house and basement, to an outlet on the gable end, in all about 10 metres. Result? The fan extracted the air until the fan stopped running, and the compressed air simply returned through the grille, no use whatsoever...yer far*s just came back!
I fitted a centrifugal fan, and it does the job very well. It has back-draught shutters, too. Ok, it sticks out from the wall a bit, but it would be possible to recess it. Next time, as I have a nice cavity to work with (ooh, missus!) I will install an inline fan behind the wall, or in the ceiling cavity. BTW, just a Manrose centrifugal fan from screwfix, not expensive, and 15 years on I replaced it last month for exactly the same model.
 

Electrician Talk

Electrical Forum

Welcome to the Electrical Forum at ElectriciansForums.net. The friendliest electrical forum online. General electrical questions and answers can be found in the electrical forum.
Electrical 2 Go - Electrical Supplier and Electrical Wholesalers
Electrical Insurance
ElectriciansForums.net (formerly known as ElectriciansForums.co.uk) was setup in April 2006 to provide free electrical advice to both professional and DIY electricians. Whether seeking advice for auto electrics, trying to find electrical installation condition reports (EICR) form downloads, or whether you're here just to talk to other electricians; we've been a first-choice website for tens of thousands of sparkies for well over a decade.
Top