The Colt Top is the most popular selling anti downdraught cowl in the UK. Suitable for use on all fuels it prevents downdraught as well as keeping rain and birds out of your chimney.Colt Tops work on the same principle as Colt Cowls but are more efficient as their circular shape creates lift whichever direction the wind is blowing, eliminating downdraught. Rain drains help divert water outside the chimney pot. Colt Cowls All Purpose Cowl Advantages Buff colour blends well with certain chimney pots, and buildings which have a sandstone/ limestone appearance Suitable for all fuels (removing birdguard for solid fuels is recommended) Static anti downdraught cowl in aluminium and powder coated in terracotta. All strap fixings and birdguard are stainless steel as well as standard hook bolts also made from stainless steel. Tested under new regulation BSEN 16475-7:2016 and BSEN-1856-1:2003 Fully assembled No special tools required for installation Effective at solving downdraught problems when wind blows from any direction Withstands flue temperatures up to 200 degrees celsius Suitable for up to 250mm internal - 300mm external. If your pot exceeds these measurements please consider using the Oversize Pot Adapter Flat. Comes with rain gauge to effectively prevent rain ingress into your chimney Specifications Height: 135mmWidth: 435mmInternal Flue Size: 125mm to 250mmMaterial: AluminiumColour: Buff