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W415-0204 / C / 10.02.01
Room Volume = Length x Width x Height
Max BTU/hr = Room Volume x 1000 ÷ 50
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
unconfined space.
The total unconfined space: 800 + 1200 = 2000 cubic feet.
Maximum BTU/h:
2000 x 1000
= 40,000 BTU/h
If there are no more fuel burning appliances within this
space then the 30,000 BTU/h input of the fireplace is suit-
able to be installed. This also assumes that the construc-
tion of this space is not unusually tight.
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:
800 x 1000
= 16,000 BTU/h
This would be considered a confined space since it can
not support the 30,000BTU/h input of the heater and it
would be necessary to provide adequate combustion and
ventilation air to Room 1.
LENGTHLENGTH
LENGTHLENGTH
LENGTH
HEIGHTHEIGHT
HEIGHTHEIGHT
HEIGHT
WIDTHWIDTH
WIDTHWIDTH
WIDTH
ROOM 2
ROOM 1
FIGURE 4
Unusually tight construction is defined as con-
struction where:
a) Walls and ceilings exposed to the outside atmos-
phere have a continuous water vapour retarder with a
rating of 1 perm (6 x 10
-11
kg per pa-sec-m
2
) or less with
openings gasketed or sealed, and
b) Weather stripping has been added on openable
windows and doors, and
c) Caulking or sealants are applied to areas such as
joints around window and door frames, between sole
plates and floors, between wall-ceiling joints, between
wall panels, at penetrations for plumbing, electrical, and
gas lines, and at other openings.
An unvented room heater is recommended for use as a
secondary heat source rather than as a primary source.
Gas combustion produces water vapour which could oc-
cur at the rate of approximately one ounce of water for
every 1,000 BTU/hr of gas input. During the cold weather
season, indoor humidity levels tend to be low. Conse-
quently, this water vapour can enhance the living space.
However if a problem should occur:
a) ensure sufficient combustion and circulation air
b) use a dehumidifier
c) do not use the unvented room heater as a primary
heat source
Without sufficient fresh air for proper operation, poor fuel
combustion can result. Carbon Monoxide is a result of
poor combustion.
If additional fresh air
is required, use one of the
methods described in the National Fuel Gas Code,
ANSI Z223.1, Section 5.3 or the applicable local code.
If for example,
the length of the rooms is 10 feet,
the width of Room 1 is 10 feet,
the width of Room 2 is 15 feet
the height of the rooms is 8 feet.
The volume of Room 1: 10 x 10 x 8 = 800 cubic feet.
The volume of Room 2: 10 x 15 x 8 = 1200 cubic feet.
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