Mike Cantrell wrote:Ahhhhhh... I see. In the US, we call those "turbine vents."
Max, I remember you used an electric fan in your exhaust path and it helped. Did you try a rotorvent/turbine vent first?
Yes i did, but, since it was against a wall, it didn't work well at all, hence the electric fan.
Steve Farmer wrote:is this a mythical perpetual motion machine that uses the exhaust flow to power itself into increasing the exhaust flow. I've never seen such a vent used or marketed so cant judge the device in question, but it reminds me of a scam product that is sold to motorists who are told they can enhance their engine intake airflow with it. Or is it powered by wind outside?
Not at all. It is supposed to act a bit like an H cowl. If it's not windy, it doesn't turn with the exhaust gases. When the wind makes it turn, also pushing the gases back in the chimney, the downwind fins create a depression, counteracting the overpresure which could cause smokeback.
At least, this is how i understand it. Theses are pretty common in France.