need an effective fan with no backdraft or noise

[seneca]

Posted this on another section and have been told to ask here -

Is there a decent (powerful) fan out there that can effectively stop backdrafts and does not have noisy flaps?

I have a kitchen fan and a bathroom fan that are both on west facing walls. There are dirctly facing strong westerly winds so there is a fair amount of drafts that come in. I've tried fitting all manner of cowls and flaps and they just end up flapping, making lots of noise and allowing drafts in.

What do you guys think is the most effective fan/backdraft sytem that will provide good extraction, no backdraft and no noisy flaps. Is there something that has an electronic shutter of some sort that only opens when powered on?

heard mention of "iris shutters" - anyone know about these?

 

[333rocky333]

Take a look at an ICON fan,there are various sizes, colours and power levels.
Basic one, ICON 15 is about £30

http://www.iconfan.co.uk/

EDIT
Link added.

 

[1john]

as rocky said, the ikon has the iris shutter. I think it is the nicest looking fan available.