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-2-
oxygen supply is one source of carbon
monoxide.
14. If this heater is installed in a room having a
high vertical dimension, a fan to circulate the
air is recommended to improve the comfort
level in the room. When a fan is used to
circulate air, it should be located so that the
airflow is not directed at the burner.
15. If installed in a garage, this heater must be
wall mounted only. The bottom of the heater
must be a minimum of 18" above the finished
floor.
16. A vent-free gas heater will increase the
amount of humidity in the room in which it is
installed.
17. A fresh air opening for combustion and
ventilation air must be provided in the room
where the heater is installed. The opening
must have at least one square inch of free air
opening per 1,000 Btu/hr of gas consumption
for the total input rating of all gas equipment
in the space.
18. This heater shall not be installed in a room or
space unless the required volume of indoor
combustion air is provided by the method
described in the National Fuel Gas Code, ANSI
Z223.1/NFPA 54, the International Fuel Gas
Code, or applicable codes.
19. The National Fuel Gas Code defines a
confined space as a space whose volume is
less than 50 ft
3
per 1,000 Btu/hr (4.8 m
3
/kw)
of the aggregate input rating of all appliances
installed in that space and an unconfined
space as a space whose volume is not less
than 50 ft
3
per 1,000 BTU/Hr (4.8 m
3
/kw) of
the aggregate input rating of all appliances
installed in that space. Rooms
communicating directly with the space in
which the appliances are installed, through
openings not furnished with doors, are
considered a part of the space.
20.
WARNING: If the area in which the heater
may be operated is smaller than that defined
as an unconfined space, provide adequate
combustion and ventilation air by one of the
methods described in the National Fuel Gas
Code, ANSI Z223.1/NFPA54, Air for
Combustion and Ventilation, or applicable
codes.
21. WARNING: If the area in which the heater
may be operated does not meet the required
volume for indoor combustion air, combustion
and ventilation air shall be provided by one of
the methods described in the National Fuel
Gas Code, ANSI Z223.1 / NFPA 54, the
International Fuel Gas Code, or applicable
local codes.
22. Unusually tight construction is defined as
construction where:
a) Walls and ceilings exposed to the outside
atmosphere have a continuous water vapor
retarder with a rating of 1 perm (6x10-11 kg
per pa-sec-m2)or less with opeings gasketed
or sealed;
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 other openings.
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