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The fluctuations of pressure in the flue are smoothed out. Downdraughts which blow dirt and dangerous fumes into your room and choke the fire are completely eliminated and the excessive fuel burning due to overdraw is substantially reduced. And having no moving parts there is no noise, maintenance or jamming.
The aerofoil section between the upper vanes deflects wind from any direction to the horizontal - even if it is blowing vertically downwards. Wind entering between the lower vanes is accelerated by the narrowing space or venturi. The combined effect is to convert all winds to the laminar, horizontal flow across the chimney opening. The bleed system below the lowest vane compensates for wind speed by allowing more air to be drawn in underneath the aerocowl rather than up the flue. |
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