An aerodyne or aero antidown draught cowl for solid fuel. As wind from any direction passes through the cowl the unique venturi shaped surfaces cause a drop in air pressure, which draws smoke and fumes up the chimney for dispersal to the ouside athmosphere, this cowl is not suitable for gas fires. The smart aerodyne chimney cowl will fit most conventional chimney pots, it is suitable for use on solid fuel systems - logs, coal, peat