A H Cowl is a simple yet effective solution for helping to reduce a down draught problem. It ensures the flue gases are released into the atmosphere. In non-problematic weather conditions the flow of gases simply exhaust outwards through the top of both vertical uprights. However in down draught conditions the problematic down draught will enter from the top of the vertical sections of the H cowl and blow downwards towards the base of the vertical sections where they meet the exhaust gases and exit through the base of the verticals thus helping to reduce the chimney down draught problem. The unit is tapered and designed to fit inside a chimney pot. It also incorporates a stainless steel band system to further stabilize the cowl. The H Cowl is available for standard 200mm and 225mm Clay pots.