Air supply for combustion appliances

All combustion appliances require the supply of air for combustion and to ensure the proper operation of the flue. A flueless appliance also needs air to ensure that the products of combustion are safely dispersed to the outside air. In some cases, combustion appliances may also require air for cooling control systems and/or to ensure that casings remain safe to touch. The size of air vent required, which is dependent upon the type of fuel burned, is given in Sections 3, 4 and 5 and is for one combustion appliance only. If a room contains more than one combustion appliance the air supply provisions will have to be increased.