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Gas Fired Models - Ventilation
Permanent ventilation for a combustion air supply into the kitchen is recommended and in some cases may be essential, particularly if the room is well sealed, or there are other appliances fitted. Extractor fans and cooker hoods do not provide an air supply into the room as they are busy sucking air out! Normally an airbrick sized 6 x 9 inches will be sufficient.
Balanced Flue cookers do not require an air-vent.