Worcester Telescopic Horizontal Flue Kit is suitable for use with Worcester Greenstar boilers and provides a quick and easy method to dispose of the fumes from a boiler and central heating system. It is used when a flue is being installed through a flat or pitched roof. It is designed to be used outside on the roof once the pipes from the boiler have been fed through. The anti-corrosion material means that the roof kit will be longer lasting. The flue can be extended in length from 350 – 570mm.