The flue in a stove or fireplace

The flue in a stove or fireplace

One of the most important parts for the proper functioning of a fireplace is the flue duct. Thanks to this element, one can enjoy the pleasant heat of the fire without the danger of smoke and gases contaminating the interior of the rooms, as well as helping wood-burning fireplaces keep the fire lit and prevent it from going out due to a lack of air.

In order to properly fulfill its purpose, the flue duct must be well manufactured and installed, as well as undergo regular maintenance and inspections. If the flue duct is not clean, residues can clog the outlet and cause the chimney to not function properly. A significant portion of fireplace malfunctions are due to a flue duct in poor condition.

What is the flue duct in a stove or fireplace?

It is a structure or pipe that is responsible for conducting and expelling the smoke and combustion gases generated during the fuel burning process (such as wood, coal, pellets, gas, etc.) towards the exterior of the dwelling or building. It is an essential component to ensure the safety and proper functioning of a stove or fireplace.

How to save energy with a fireplace

The flue duct is usually made of heat-resistant materials, such as stainless steel or ceramic, and extends from the combustion chamber of the stove or fireplace to its outlet to the exterior, typically through the roof or the facade of the building.

In addition, this duct also helps maintain proper draw, which is the airflow that facilitates combustion and prevents the entry of smoke and harmful gases into the interior of the space where the stove or fireplace is located.

How a flue should be

Regardless of the fireplace models we have or want to install, the flue must have certain characteristics. For example, indoors, it should always be circular, have sufficiently strong thermal insulation to withstand the temperature reached by the chimney, and ideally have no angles or angles not exceeding 45 degrees.

It should not be placed next to flammable materials or inside ventilation ducts, pipes, or anything similar. Additionally, the pipe must reach the end of the chimney stack. Otherwise, the bricks will cool down the smoke as it exits, and its density will cause it to descend back into the interior.

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Unable to install a chimney for multiple appliances, such as a stove and a fireplace, for example. Each of them must have its own outlet to prevent smoke from entering the house. In the case of having multiple chimneys close together, they need to be placed at different heights to prevent the outgoing smoke from re-entering through the other chimney.

Design, dimensions, and proportions of chimneys

The chimney cap, a key piece

One of the components that every chimney must have is the chimney cap. This cap must be manufactured and installed in such a way that it allows the exhaust of smoke even under adverse conditions. Its size should be twice that of the interior of the flue and it should protect it from rain or any other element that could seep through the pipe. Additionally, it should be easy to inspect for cleaning and maintenance tasks as needed.

chimney flue

Choosing the right components is key to enjoying the warmth of a good fire. The chimney and the chimney cap, together with fireplace doors without construction work, ensure proper smoke expulsion at all times.

Currently, all manufacturers have adapted to the requirements of the European Union to sell their products. This way, problems can be avoided, which are often related to poorly performed installations or choosing a fireplace that is not suitable for the space that needs to be heated, either due to deficiency or excess.