help with buying a bathroom extractor fan

MissG_2

I need to buy a bathroom extractor fan to replace our existing one when the bathroom is getting fitted, I have been looking for hours but cant figure out which one I need or will be good. It will be going above my bath and electric shower, from floor to ceiling measures 2300 mm. We live in a flat and the existing ducting pipe runs through the bedroom to the outside. can anybody help?

macman

The important part is the length of the ducting run. That determines the type of fan you need-sounds like you need a centrifugal model.
Most are either 4 or 6 inch models.
Then you need to choose how it will be activated: light controlled, manual, humidistat, timer etc.
Have a look at this:
http://www.dchomewood.co.uk/content.php/45220

MissG_2

macman wrote: »

The important part is the length of the ducting run. That determines the type of fan you need-sounds like you need a centrifugal model.
Most are either 4 or 6 inch models.
Then you need to choose how it will be activated: light controlled, manual, humidistat, timer etc.
Have a look at this:
http://www.dchomewood.co.uk/content.php/45220

I have measure the bedroom and the lenghth of the run is 2500 mm plus the thicknes of bathroom wall. I know the duct is 100mm. The one we have at the minute comes on when we switch the light on and it has a humidistat but we have never had that on. we have been pleased with whats in but just thought as the bathroom is being done it would be best to change it. we currently have a greenwood airvac think its NTX100HT.

macman

So you want an extractor of 4 inch size.
I don't see how the ducting can be only 2.5m, unless it's across the width of a boxroom?
If the current one is OK, no real need to change it, just remove it and clean it while you are doing the renovations.
If the humidistat is not coming on then you need to adjust the settings on it.

MissG_2

macman wrote: »

So you want an extractor of 4 inch size.
I don't see how the ducting can be only 2.5m, unless it's across the width of a boxroom?
If the current one is OK, no real need to change it, just remove it and clean it while you are doing the renovations.
If the humidistat is not coming on then you need to adjust the settings on it.

It is only 2.5m I have measured, it's the smaller side of a small bedroom as the bathroom wall comes into the bedroom one side...... it's so hard to explain. I have been looking but up to now i can only find a centrifugal with a IP24 am i correct in thinking i need an IP?5 as it would be within the 2.25 of bath/ shower as the floor the ceiling height is 2.3?

macman

IPx4 is required if within zone 1 (above shower and less than 2.25m above floor level). Above that , it's out of zone and no IP rating required.
http://lights4bathrooms.co.uk/ipratings.html
You can consider a low voltage type (SELV) instead for such a location.
Have a look at this site and range, the Airflow Icon axial models are usable with up to 2.5m ducting, so may just be withinr the scope of your layout.
http://www.airflow.co.uk/whattypeoffanandwhere

zax47

Another vote for the Airflow ICON range, I fit loads of these and would thoroughly recommend then. Timers, humidistats etc are all plug-in modules to the basic fans. Not bad looking either, better than your typical square box.

http://www.airflow.co.uk/productcat/pg_V/iCON-Range

Don't let those prices frighten you - they are cheaper at many, many other places, both online and electrical wholesalers. They are well worth the money though. Hint: look at Ebay....