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 & installed in the last 80 years. This product has stood the test of time & is still popular with many installers today as it has a proven track record of reducing downdraught. 1.0mm aluminium Easy fixing with tried & tested hook bolts No tools required to fit Withstands flue temperatures up to 200 degrees Celsius Maintenance free 285mm height, width 310mm One size fits all flue sizes between 150-250mm Steel hook bolts electro plated For optimum performance, position one of the corners of the Colt Cowl directly facing the prevailing wind