May depend a little on what type of fire you have and how hot it gets? My father used to bring home various offcuts of timber from a furniture factory and burn it on the open fire in the living room. Then one day the room started to fill with smoke. When he threw the rods up the chimney he found tha...

Used to a post on Dick Strawbridges old forum from a bloke who built a 2Kw wind turbine. seems like most of the info was nuked during a server move? some still over at this site that may be useful/interesting though?

http://www.reuk.co.uk/DIY-2kW-Wind-Turbine.htm