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19.2A
EXAMPLE 1:
In this example, because there is no door to the adjoining room, the volume of the adjoining room may be
added to the volume of the room with the heater to get a total unconfi ned space.
The total unconfi ned space: 400 ft
3
(11.3m
3
)+ 600 ft
3
(17m
3
) = 1000 cubic feet (28.3m
3
).
Maximum BTU/h: 1000x1000 = 20,000 BTU/h
50
19.3
EXAMPLE 2:
If in this example a solid door separates Room 1 from Room 2, the volume of Room 2 could not be used. In
this case the maximum BTU/h would be:
Maximum BTU/h: 400x1000 = 8,000 BTU/h
50
This would be considered a confi ned space since it can not support the 9,000 BTU/h input of the appliance
and it would be necessary to provide adequate combustion and ventilation air to Room 1.
19.1C
Room Volume = Length x Width x Height
Max BTU/hr = Room Volume x 1000 / 50
LENGTH
HEIGHT
ROOM 2
ROOM 1
WIDTH
If for example:
The length of the rooms is 5 feet (1.5m),
The width of Room 1 is 10 feet (3.1m),
The width of Room 2 is 15 feet (4.6m),
The height of the rooms is 8 feet (2.4m).
The volume of Room 1: 5x10x8 = 400 cubic feet
(1.5 x 3.1 x 2.4 = 11.16 cubic meters)
The volume of Room 2: 5x15x8 = 600 cubic feet
(1.5 x 4.6 x 2.4 = 16.56 cubic meters)
W415-1158 / B / 01.09.17
9
EN
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