Downdraughts can be caused by several different conditions. The fire opening can often be too large for the draw of the flue, cold air in the chimney can often prevent the warm air rising, and atmospheric weather conditions can restrict the flow of exhaust gases. However, the main reason for downdraughts is the position of the property; if it is on a hillside, a steep valley or surrounded by other large buildings or trees, then depending upon the direction of the wind downdraughts can occur. We fit a variety of different cowl that counters this effect.