Several types of flues that can be used with gas boilers

A gas boiler flue is a pipe or duct that is used to vent the exhaust gases produced by a gas-fired boiler out of a building. The flue typically runs from the back of the boiler through the wall or roof of the building to the outside air.

The purpose of the flue is to safely remove the exhaust gases produced by the boiler, which can be harmful to humans if they accumulate in an enclosed space. The flue also serves to prevent the build-up of carbon monoxide (CO) in the home, which can be deadly if it reaches high levels.

There are several types of flues that can be used with gas boilers, including:

Chimney flues: These flues are typically made of masonry or metal and are used to vent the exhaust gases up and out through the roof of the building.

Fan-assisted flues: These flues use a fan to help move the exhaust gases out of the building more quickly.

Balanced flues: These flues use a combination of natural and forced convection to move the exhaust gases out of the building.

It is important to ensure that the gas boiler flue is properly installed and maintained to ensure the safe and efficient operation of the boiler. This includes regularly inspecting and cleaning the flue to remove any build-up of debris or obstructions, and making sure that the flue is not damaged or obstructed in any way.