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Discharging products of combustion

  • Extractor hoods connected directly to the outside must be capable of allowing the products of combustion of the gas appliance to be discharged.
  • If this is not possible, an electric fan may be used, attached to the external wall or window.
  • The fan should have the capicity to circulate air at an hourly rate of 3 to 5 times the total volume of the kitchen.
  • The room chosen to accomodate the gas appliance must have an adequate natural air supply to allow full combustion of the gas.
  • The air supply must be produced directly by one or more vents made in an external wall and must provide a total opening of at least 100cm2.
  • The vents must be positioned close to the floor, preferably on the opposite side to the combustion discharge outlet and must be designed in such a way that they are not obstructed from either the inside or outside.
  • When it is not possible to provide the necessary vents, the air supply may be supplied from an adjacent room, ventilated in the required manner, provided that it is not a bedroom or an area with risk.
  • In this event the door of the kitchen must be provided with ventilation slots to allow the air to enter the room.

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