CHOOSING SUITABLE SURROUNDINGS
DISCHARGINGPRODUCTS OFCOMBUSTION
In the room chosen to accommodate the gas appliance, there
must be an adequate natural draft to allow combustion of the
gas.
The natural draft must be produced directly by one or more
vents made in the external walls and providing a total
opening of at least 100 cm².
If the appliance does not have a no-flame safety device, this
openingmust have an area of at least 200 cm².
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 cannot be
obstructed either from the inside or the outside.
When it is not possible to provide the necessary vents, the
draft may be supplied from an adjacent room, ventilated in
the requiredmanner, provided it is not a bedroom or an area
at risk.
In this event, the door of the kitchenmust be opened to allow
the draft to enter the room.
Extractor hoods connected directly to the outside must be
provided, to allow the products of combustion of the gas
appliance to be discharged (fig. 5.4).
If this is not possible, an electric fan may be used, attached to
the external wall or the window; the fan should have a
capacity to circulate air at an hourly rate of 3-5 times the total
volumeof the kitchen (fig. 5.5).
The fan can only be installed if the room has suitable vents to
allow air to enter, as described under the heading “Choosing
suitable surroundings”.
Fig. 5.5
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Fig. 5.4