Flue

Definition - What does Flue mean?

A flue is a pipe or duct that is used for releasing exhaust gases from sources like boilers, water heaters or generators to the outside environment.

A flue operates under the principle of buoyancy or through the aid of blowers. The typical combustion products induced by a flue include carbon dioxide and other harmful compounds.

Corrosionpedia explains Flue

Flues can be adjusted and are usually designed to release toxic gases into the atmosphere. The most common types of flue are:

  • Closed flue - In this type, air ducts direct combustion air straight to the equipment, such as a boiler. Since air can have no movement between the appliance and the room that contains it, combustion products are not discharged from the room.

  • Open flue - This type pulls combustion air straight to the appliance, and exhaust gases rise up to the flue. This type of flue works under the same principle as how fireplaces work.

In industrial settings, flues are commonly present in boilers. The purpose is to increase steam pressure and enhance the efficiency of engines. Such vents are usually present in boilers in order to prevent incidences of boiler explosion which can take place when toxic gases build up within the boiler tanks.

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