In general, you definitely can. In the industry, it is commonly known as a twin wall flue or insulated twin wall. Essentially, it is a factory-manufactured metal flue system that features an inner stainless steel layer to transport the flue gases, encased in insulation material (ranging from 25 to 35mm in thickness) and topped with an outer metal layer, which is often finished in a black powder coat.
What size will the flue be?
There are two standard flue sizes, known as 5-inch and 6-inch, which refer to their internal dimensions. The external dimensions are approximately 175mm for a 5-inch flue and 200mm for a 6-inch twin wall flue system.
What colour will the flue be?
The majority of our installations using insulated twinwall flue are typically finished in a black powder coat, although a polished stainless steel option is also available.
Where will the flue exit?
The two alternatives would involve either exiting via the roof or exiting through an exterior wall at a 45-degree angle.
How does the flue exit the wall?
Our team utilizes a specialised diamond drilling rig to accurately create a 45-degree aperture for the flue system to exit through an exterior wall, with a diameter of either 225mm or 250mm. Our specialised equipment ensures that there is no disturbance to the surrounding masonry, resulting in a uniformly clean aperture for the flue to exit.
How does the flue exit the roof in a single storey building?
The flue can exit directly through the roof in a single-storey building, whether it has a flat ceiling or a sloped ceiling. It can also extend into a roof space or attic before finally exiting the roof. In this configuration, the flue, as it passes through the ceiling or into the roof space, will be fitted with a cover plate. This plate is designed to shield the area surrounding the flue, ensuring a necessary clearance from combustible materials such as plasterboard and timber. The cover plate can be round for a flat ceiling or rectangular for a pitched or sloped ceiling, as it is adjustable to accommodate different angles.
How does the flue exit the roof in a multi storey building?
If the flue is to exit in a multi-storey building, it will likely pass through a bedroom, for instance. In this case, the flue must be enclosed within a timber stud and plasterboard structure, ensuring that the necessary distances from combustible materials used in the construction are maintained. The enclosure is designed to be ventilated, allowing warm air to escape and preventing accumulation. The ceiling of the room will feature a ventilated fire stop plate, complemented by a decorative masking plate to conceal it. The enclosed structure will also incorporate ventilation through the fire stop plate; however, it will not include the masking cover plate since it will not be visible within the enclosure. If the flue traverses an accessible attic space, it will be safeguarded with a metal cage to prevent any items from coming into contact with the flue system.
What supports the insulated twin wall flue system?
The insulated twin wall flue is held in place by different types of brackets, which vary based on the installation location, such as whether it is concealed in a roof space or mounted on a wall. As a general guideline, a minimum of two support points is required.
