Best place for extractor fan?

[Ian H]

My bathroom is like this and the shaded area would be the easiest place to put it due to a loft room above.

There is an RSJ parallel to the window 500mm into the room.

Where's the best place for it?

Thanks

 

[EddieM]

on an external wall

 

[JohnD]

furthest from the door, so that the replacement air sucked under the door will push the warm moist air towards the extractor.

the wall at the bottom of the pic.

Showers make the most steam

If you can't suck from above the shower, then the bath corner is the best you can do.

 

[Ian H]

on an external wall

There is only a bit of external wall above the toilet, there are bedrooms either side. The tiles are hard porcelain too so not sure how hard it would be to core drill them.

furthest from the door, so that the replacement air sucked under the door will push the warm moist air towards the extractor.

the wall at the bottom of the pic.

Showers make the most steam

If you can't suck from above the shower, then the bath corner is the best you can do.

I could go above the shower somewhere near the head, maybe just outside the screen?

 

[JohnD]

inside the screen would be even better, it could suck away the steam before it has the chance to diffuse into the room

provided the extractor can be 2250mm or higher above floor level

see "zones"
https://electrical.theiet.org/wirin...on-701-locations-containing-a-bath-or-shower/

 

[JohnD]

The tiles are hard porcelain too so not sure how hard it would be to core drill them.

very hard, and I think your core will go blunt.

However you can use a diamond wheel to cut a square out of the tiles, that you can core inside. The fan body should be big enough to hide the square.

 

[Charlie George]

Is there a void in ceiling? you could use a ceiling fan.

 

[endecotp]

Definitely inside the shower compartment,

Anywhere else and it will just draw air in under the door and straight out through the fan without changing any of the damp air in the shower.

Note that this makes it a more restricted location electrically.

 

[Ian H]

The ceiling is 2350mm high

inside the screen would be even better, it could suck away the steam before it has the chance to diffuse into the room

provided the extractor can be 2250mm or higher above floor level

see "zones"
https://electrical.theiet.org/wirin...on-701-locations-containing-a-bath-or-shower/

The ceiling is 2340mm and the fixed head a bit lower.

So from your link I read:

'The height of zone 1 and zone 2 are limited either by the horizontal plane corresponding to the highest fixed shower head or water outlet, or the horizontal plane lying 2.25 m above the finished floor level, whichever is higher.'

If I mount it on the ceiling it will be outside of these Zones?

The ceiling joists are 8x2's at 400centres so I could go into a void in the room above then out over the bedroom through the side of the house. I guess I'm better with a slight fall where it goes over the bedroom? I'd be using some 110 or 160mm underground drain pipe.

 

[JohnD]

if you can put it above the ceiling, you can use a ducted inline fan, which can be much more powerful than the ordinary 80cu.m/hr bathroom fans, and surprisingly quiet. Better fit a trap in the floor above for access.

For example this one is a good make
https://www.tlc-direct.co.uk/Products/SLTD160.html

there are cheaper brands, such as manrose. Look at air throughput, in cu.m/hr, and at noise, in db, before choosing.

My preference is for one that comes on with the light switch and has a run-on timer, as people often don't bother turning on fans if they have to make a conscious effort.

 

[Anstiss Ltd]

You can get extractor s that replace light fittings.

They still have the light but it's vent is round it.

So you could replace that spot you have in the ceiling almost above the shower.

They use an online fine in the duct