Different Types of Flue Design


A flue design refers to the structure of a vertical chi […]

A flue design refers to the structure of a vertical chimney that discharges hot air as a by-product of combustion in a furnace, fireplace, boiler, or other heat-producing system. The design choices for the flue are internal or external to the building and can be modified to support multiple heat sources or lined to adjust the size of existing chimneys. Airflow in a flue design includes airflow using natural ventilation holes and airflow supported by a blower or fan. Sheet metal is often used to form flue ducts. The simplest type of flue design is an internal vertical tube or channel that runs directly through the roof of a building from the heat source. In residential areas, flues must be insulated where they meet walls or ceilings to protect these structural components from the high temperatures of the flue. For safety, flues are often lined. The connection point of the flue to the roof of the building must be carefully sealed externally against weather influences. A flue design discharges hot air as a by-product of gas stove combustion. In order to accommodate two different heat sources, and there is only one opening on the roof, a double flue design can be used. The vertical space of the flue is divided into two independent channels, so that the exhaust gas of the two heat sources can be discharged independently. This structure also The exhaust gas of the heat source on different floors of the building can be discharged, and the external flue can be directly led from the heat source to the outside and then run vertically to its remaining height. This flue design may be less efficient because the entire flue is exposed to cooler outside air. Connecting the heat source to the flue and avoiding the eaves at the roof line requires using an angle no more than 45 degrees from vertical. These joints may require more frequent cleaning due to increased soot buildup at the bend. To retrofit an existing chimney to a new heat source, a flue kit is an excellent flue design solution. The flue kit consists of sheet metal tubes that can be cut and assembled for use in existing chimneys. This solution is often easier and more cost-effective than building a whole new chimney. The flue design can be open and balanced, and a system that uses only natural ventilation is an open system. A balanced system is one in which the heat source does not draw air from the surrounding room, but is sealed and has its own vent or air source. In a tightly sealed modern home with no outside air entering the house, if the heat source lacks an independent air supply. The fan system includes a blower that turns it into a forced ventilation system to ensure air supply to the heat source and movement of the air over the flue.

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