The Colt Cowl is the very first ever commercially successful mass market anti downdraught chimney cowl. First produced by Colt in 1931, over 3 million Colt Cowls have successfully been sold and installed in the last 80 years. This product has stood the test of time and is still popular with many installers today as it has a proven track record of reducing downdraught. For optimum performance, position one of the corners of the Colt Cowl directly facing the prevailing wind. Colt Cowls Anti-Downdraught Advantages 1.0mm aluminium Easy fixing with tried and tested hook bolts No tools required to fit Withstands flue temperatures up to 200 degrees Celsius Maintenance free One size fits all flue sizes between 150-250mm Steel hook bolts electro plated Specifications Height: 285mmWidth: 310mmInternal Flue Size: 150mm to 250mmMaterial: Aluminium