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[tigertiger]

A question for the engineers perhaps.

I am looking for a non-powered extractor fan.

Like the impellers on dog vans. They will spin in the wind and extract air or blow air in.

Does such a thing exist?
Where can I buy them?

I need them to ventilate a small room.

[6705russell]

Try these, bought a couple myself some time ago....

Russ


http://www.vangadgets.co.uk/roof-vents-for-vans.htm

[catengineman]

Look for products they may have what you are requiring

http://www.ktduk.com/department/roof_beacons_and_vents/

[tr7v8]

Solar powered ones available from boat chandlers as well.

[wullie/mk2]

You also get them for fitting into a window either 5in or 6in, with a cord adjuster to open/close ..or you can get the cheaper version, that has no cord, approx price £4

[tony52]

You also get them for fitting into a window either 5in or 6in, with a cord adjuster to open/close ..or you can get the cheaper version, that has no cord, approx price £4

These are nomally sold as 'vent a matic' - easily found via google or available on ebay.