Draft from bathroom vent

Mola1

I don't know if its the best place to post this but we live in a relatively new house 5 years old and the bathroom upstairs has a vent fan leading to outside and since the weather has got colder we have a terrible draft coming through it, the bathroom is freezing at the minute.
Is there an alternative we could have fitted so that the draft isn't as bad? The other vents in the house are fitted to the roof so aren't a problem, I don't know why this is done different.

donedl1

Centrifugal Fans

Designed to move air over longer distances than axial fans, fitted with built-in spring operated non-return flap into the discharge to stop back draughts. Manufactured using high impact ABS thermoplastics, powered by a 230 V, 50 Hz motor. For use in bathroom and toilet. The timer model has 2 to 30 minute time adjustment.
Protection rated to IPX4. Extract rate : 90 m³/h, 25 l/s.
Part No. Description Unit Price Qty
19390 100 mm, centrifugal fan £14.78
19391 100 mm, centrifugal fan, humidistat and timer £22.52


BES Ltd do these fans, you may find them locally.

freddyuk

Just fit an anti backdraught shutter in the pipe. Or you can fit directly above the fan unit. You may need to remove one of the springs to ensure it opens under load.
http://www.ebay.co.uk/bhp/back-draught-shutter

Mola1

Thats great, thank you!