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COMBUSTION / VENTILATION AIR
Provide adequate ventilation to the appliance in accordance with the rules in force in the coun-
try of installation. Where rules do not quote the minimum ventilation opening sizes use the
sizes shown.
This appliance requires air for combustion and ventilation. Ideally, this air is obtained from out-
doors, but under certain conditions may be obtained from within the dwelling.
If this combustion/ventilation air is not sufficient, a dangerous condition may exist such as fire,
explosion, property damage, or personal injury, including death. Sufficient air for combustion of
this and any other gas fired appliance must be considered, as well as the air evacuated by the
use of exhaust fans, range hood ventilators, fireplaces, dryers, etc.
UNCONFINED SPACE
The consideration for the amount of necessary air is dependent upon whether the heater is in-
stalled in a confined or unconfined space or area.
An unconfined space is defined as - a space or area with a volume greater than 4.85m3 / 1kW
of the combined input of all gas fired appliances in the space. This space includes communi-
cating spaces not separated by a door.
CONFINED SPACE
A confined space is - an area with a volume of less than 4.85m3 per 1kW of the total input of
all gas fired appliances contained in that space.
Some spaces may appear to be unconfined but the addition of energy conserving methods
such as weather stripping, caulking, air-tight envelope or others items may reduce the infiltra-
tion to such a degree that the introduction of air from an adjacent location or the outdoors may
become necessary.
When the heater is installed in a confined space the ductwork must be brought to a location
outside that space. It must also be sealed airtight to the unit and / or mounting platform. The
platform must be of airtight construction.
COMBUSTION AIR FROM INDOORS
The confined space shall be provided with two permanent openings communicating directly
with an additional room(s) of sufficient volume so that the combined volume of all spaces
meets the criteria for an unconfined space. The total input of all gas-fired appliances installed
in the combined space shall be considered in making this determination. Each opening shall
have a minimum free area of 22cm2 per 1kW of the total input rating of all gas fired appliances
in the confined space, but not less than 645cm2. One opening shall be 305mm from the top of
the space and the other shall be 305cm from the bottom. The minimum dimension of air open-
ings shall be not less than 8cm.
COMBUSTION AIR FROM OUTDOORS
When combustion/ventilation air originates outdoors the confined space must have two per-
manent openings. One should be 305mm from the top of the space and the other 305mm from
the bottom of the space.
These openings shall communicate directly, or by ducts, with the outdoors or spaces that
freely communicate with the outdoors. The minimum dimension of air openings shall not be
less than 8cm.
Where
directly
communicating with the outdoors, each opening shall have a minimum
free area of 5.5 cm2 per 1kW of total input of all equipment in the space.
Where communicating with the outdoors through vertical ducts, each opening shall have
a minimum free area of 5.5 cm2 per 1kW of total input rating of all equipment in the space.
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