Last edited 24 Feb 2021


The combustion process is: ‘The chemical process of burning via a substance (fuel) reacting rapidly with oxygen and giving off heat.’ Ref ‘Climate Emergency Design Guide: How new buildings can meet UK climate change’, published by The London Energy Transformation Initiative (LETI) in January 2020.

A combustion appliance is ‘…an apparatus where fuel is burned to generate heat for space heating, water heating, cooking or other similar purpose. The appliance does not include systems to deliver fuel to it or for the distribution of heat. Typical combustion appliances are boilers, warm air heaters, water heaters, fires, stoves and cookers.’ Ref Approved document J, Combustion appliances and fuel storage systems.

The term ‘combustion plant’ refers to any piece of equipment that involves the combustion of a fuel to generate energy. Ref The HS2 London-West Midlands Environmental Statement, published by the Department for Transport in November 2013.

The term ‘combustibility’ refers to the tendency of a substance to burn as a result of fire or chemical reaction. It is can be expressed as a property that is a measure of how easily a substance will ignite or burn, an important consideration when materials are being used or stored for construction purposes.

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