Make one , its so easy and costs nowt or nearly nowt. all that's needed is a 12v heater motor from a scrap yard, make a fan with two blades cross halved joint to make four, cut corresponding grooves in a piece of round bar , silver solder blades into end of bar, attach bar to motor and make a 20g shroud round blades with nozzle that fits the chimney, and Voila, you have a blower, Takes all of an afternoon to make. Made mine 25 years ago and still going strong. Hope this points you in the right direction. Good luck
Mick
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