This flue extension was fitted as on a windy day the exhaust fumes from the boiler were re-entering the building. The fumes are now being carried safely away above the roof-line.
This type of extension can be used if the “plume” from the flue is causing a nuisance to yourself or a neighbour, or it you wish to attach a carport or similar construction to the side of your home. Please remember the dangers of Carbon Monoxide, it is a killer and take the necessary action to ensure the exhaust fumes are carried safely away.