Bathroom extractor fans

[Harry Flashman]

Chaps,

the builders fitted rubbish, cheap extractors, and I wish to change them. Their positioning is fine, doors are vented etc - they just aren't powerful enough.

Now, I can't find anything out there (axial) that will fit into the 100mm round hole that will move more than 96 metres cubed of air per hour - and the big bathroom, according to my calculations, needs almost double that. Similarly, I need a low voltage but powerful effort for the other bathroom, alhough that's easier as around 100 metres cubed per hour is fine, given the volume of the room.

Google has turned up nothing, so any help/recommendations would be helpful.

I know that I could fit a centrifugal, but finding one with a 100 metres cubed/hour or above that will fit the existing holes and not be horribly noisy is also proving hard...

[freecar]

Air movement is restricted by size of hole, impeller design and such.

Chances are that were you to manage to get 200m2 of air through that little hole it would sound like a jumbo on take off! (think vacuum cleaner!)

[Harry Flashman]

Good point.

Enlarging the holes involves scaffolding, so not good.

However, I really don't mind the noise while having a shower - it would be genuinely worth it to clear the horriblecondensation. The override switches outside the bathroom mean that the fans can be turned off when someone's having a quiet bath...

[Wings]

Have you given thought to another one out through ceiling and roof?

[furtive]

I've fitted an inline one in my loft that sucks the condensation out of my en-suite. Can't hear the fan but can hear the suction (but it's not that loud - can't hear it over the sound of the shower for example, and can't really hear it from the bedroom). It's very powerful though.

I got this one:

http://www.tlc-direct.co.uk/Products/SLTD250T.html

[Mark Benson]

furtive said:

I've fitted an inline one in my loft that sucks the condensation out of my en-suite. Can't hear the fan but can hear the suction (but it's not that loud - can't hear it over the sound of the shower for example, and can't really hear it from the bedroom). It's very powerful though.

I got this one:

http://www.tlc-direct.co.uk/Products/SLTD250T.html

We've had something similar, the fan is sited in the loft on foam pads so only the suction is heard and it's quiet enough for my wife to have on while in the bath (completely inaudible above any running water). It will keep the room completely clear of steam during a shower, or clear the room in under 5 minutes if (when) I forget to switch it on.

[Douglas Arfempty]

Vent Axia Lo-Carbon Quadra or Solo Plus. Both wall mounted centrifugal fans, with a choice of controls.

I specify these regularly...excellent fans.

Matt

[944fan]

Manrose do a 4" wall mounted centrifugal fan with a humidistat.

http://www.amazon.co.uk/Manrose-CF200H-CF200-Humid...

Moves 110 m3/hour.

If you don't want the stat they do one with a timer which is cheaper.

[Harry Flashman]

Thanks chaps. Inline ducted centrigugal not really an option, as above the bathroom is the roof terrace. I shall have a look at that Manrose job - simple timer without humidistat would be absolutely fine!

Appreciate the help and tips; any more welcome too!

Harry.

[HONEYMON57ER]

maybe this would do?

http://www.ebay.co.uk/itm/XPELAIR-DX400T-PREMIER-C...

[hairyben]

Where is the fan mounted, if a wall is it hollow/solid and how long is the duct?

[caziques]

Why not consider enclosing the shower, hence almost no steam produced in the first place.

I don't have an extractor fitted at all, with a top on the shower condensation is minimal.

Don't forget in winter your paying for all that hot air being chucked outside.