Bathroom extractor fan

[Dambo]

Hiya guys. I'm just after a wee bit of advice

A customer wants an extractor fan fitting in their bathroom. They have a bath with an electric shower over it i.e. combined. Will the extractor fan be as effective on the wall (above the bath) as it would be on the ceiling (above the bath)?

 

[sparkytim]

If the fan is up to the job then it will pull the air out in either positions.

Just make sure it is as far away in the room from the air INTAKE, this may be from under the door, the air that the fan extractsout has to be replaced by drawing air in to the room from somewhere.

If the air intake is near to the fan it can leave a dead air spot that can allow condensation and mold.

 

[Dambo]

If the fan is up to the job then it will pull the air out in either positions.Just make sure it is as far away in the room from the air INTAKE, this may be from under the door, the air that the fan extractsout has to be replaced by drawing air in to the room from somewhere.

If the air intake is near to the fan it can leave a dead air spot that can allow condensation and mold.

There is a window in the bathroom and the extractor fan would have to go on the same wall. What happens in this instance?

 

[NozSpark]

Keep the window shut!!

Otherwise the fan won't do anything!!

TBH I've got a 4" Axial fan in my bathroom and it's next to useless.

 

[Dambo]

Keep the window shut!!Otherwise the fan won't do anything!!

TBH I've got a 4" Axial fan in my bathroom and it's next to useless.

There does seem to be some condensation related issues on the wall and ceiling above the bath / shower so surely an extractor fan would help to address this?

 

[NozSpark]

If you can go for a 4" centrifugal fan or a 6" axial... much better extraction rate!

If you go for a 6" axial then at least you can upgrade to a centrifugal if the need arises

 

[wozz]

screwfix are selling a vent axia 4" with a good extraction rate and low db comes with a few grilles aswel im going to get myself one tomorrow!

http://www.screwfix.com/prods/98990?cm_sp=CatBanners-_-position1-_-Heatingcooling&ts=27747

 

[batty]

Any chance of having inline fan in loft?

 

[Dambo]

If you can go for a 4" centrifugal fan or a 6" axial... much better extraction rate!If you go for a 6" axial then at least you can upgrade to a centrifugal if the need arises

I thought that axial fans were mainly wall / window mounted and centrifugal fans were mainly used for those fed through somewhere like an attic space?

 

[Dambo]

Any chance of having inline fan in loft?

There's no exit point from the attic for the ducting.

 

[Dambo]

I'm installing a through-the-wall bathroom extractor fan (on a timer) next week and i'm curious about one thing - What the best / easiest way of getting the feed to the extractor fan itself i.e. behind the tiles on the exterior bathroom wall?

 

[Zeespark]

Yes and chase out if poss. Just use a bit of capping/oval conduit to protect the cable (some electricians think this part is overkill) and you are done.

AndyGuinness

 

[Dambo]

Yes and chase out if poss. Just use a bit of capping/oval conduit to protect the cable (some electricians think this part is overkill) and you are done. AndyGuinness

This might sound like a real simpleton thing to ask but is it difficult to remove bathroom tiles? And then reattach them? I just haven't done it before :Blushing

 

[green-hornet]

This might sound like a real simpleton thing to say but is it difficult to remove bathroom tiles? And then reattach them? I just haven't done it before :Blushing

Its not "simpleton" at all a very good question.

Some tiles will come off in one peice but I would never tell a customer that I would do it, because some will not.

I did a kitchen a few weeks ago and the customer managed to get all the tiles off from behind his hob without breaking any.

Its just a bit risky if you take the job on then break every one only to have to pay for new ones.

 

[sparkytim]

As its an outside wall you could always come along the outside and then thru the wall.

 

[Dambo]

Its not "simpleton" at all a very good question.Some tiles will come off in one peice but I would never tell a customer that I would do it, because some will not.

I did a kitchen a few weeks ago and the customer managed to get all the tiles off from behind his hob without breaking any.

Its just a bit risky if you take the job on then break every one only to have to pay for new ones.

What about putting tiles back on the wall?

 

[green-hornet]

What about putting tiles back on the wall?

Main problem will be getting them to fix level with any other tiles, the adhesive will be stuck to the back of the tiles and with care can be removed or made less pronounced by filing.

Then its just a case of sticking them back on and grouting.

 

[Dambo]

ANOTHER bathroom extractor fan related question ROTFWL

The bathroom light (which the extractor fan is to be wired into) is fed from a junction box in the attic (which has various cables being fed to and from it). There are 2 wires feeding into the light from the junction box - 1 into switch live, 1 into neutral.

What i'm basically trying to figure out is, with the timed extractor fan being fed with 3C+E i.e. live, switched live and neutral, how do you know which is which at the junction box?

 

[sparkytim]

Switched live and Nuetral will be the two conductors going to the light, the Permanant Live will be going to the switch.

 

[PC Electrics]

There's no exit point from the attic for the ducting.

No gable end wall? No soffit you can use?

This is really good if you can find somewhere

http://www.screwfix.com/prods/41379/Heating-Cooling/Extractor-Fans/Manrose-Showerlite-Centrifugal-Chrome-White-35W-Shower-Fan-Kit