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PROVISIONS FOR ADEQUATE
COMBUSTION & VENTILATION AIR
IN UNVENTED APPLICATIONS
This heater shall not be installed in a confined space or
unusually tight construction, unless provisions are provided for
adequate combustion and ventilation air.
The National Fuel Gas Code, ANSI Z223.1/NFPA 54 defines a
confined space as a space whose volume is less than 50 cubic
feet per 1,000 Btu per hour ( 4.8 m
input rating of all appliances installed in that space and an
unconfined space as a space whose volume is not less than 50
cubic feet per 1,000 Btu per hour ( 4.8 m
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 confined space.
FIGURE 8 – ROOM EXAMPLE WITH DIVIDER
The following formula can be used to determine the maximum
heater rating per the definition of unconfined space:
WARNING: If the area in which the heater may be operated is
smaller than that defined as an unconfined space, or if the
building is of unusually tight construction, provide adequate
combustion and ventilation air by one of the methods
described in the National Fuel Gas Code, ANSI Z223.1/NFPA
54, Section 5.3 or applicable local codes.
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
-11
perm ( 6 X 10
kg per pa-sec-m
gasketed or sealed;
b)
Weather stripping has been added on openable windows
and doors;
c)
Calking 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.
3
per kw ) of the aggregate
3
per kw ) of the
2
) or less with openings
An unvented room heater having an input rating of more than
10,000 Btu per hour shall not be installed in a bedroom or
bathroom; or
An unvented room heater having an input rating of more than
6,000 Btu per hour shall not be installed in a bathroom.
INSTALLATION INFORMATION
UNVENTED APPLICATIONS
!!! WARNING !!!
This appliance is for installation only in a solid-fuel burning
masonry or UL 127 factory-built fireplace or in a listed ventless
firebox enclosure. It has been design certified for these
installations. EXCEPTION: DO NOT install this appliance in a
factory-built fireplace that includes instructions stating that it
has not been tested or should not be used with unvented gas
logs.
!!! WARNING !!!
Any modification to this unvented gas heater, or its controls,
can be dangerous. Improper installation or use of the heater
can cause serious injury or death from fire, burns, explosion, or
carbon monoxide poisoning.
!!! WARNING !!!
Solid-fuels shall not be burned in a fireplace where an
unvented room heater is installed.
WARNING: This installation is NOT complete until floor
protector ( if applicable ) is installed.
WARNING: DO NOT allow fans to blow directly into the
fireplace. Avoid any drafts that alter burner flame patterns.
WARNING: DO NOT use a blower insert, heat exchanger
insert, or other accessory, not approved for use with this
heater.
Unvented gas heaters are a supplemental source of heat; they
are not intended to be primary heating appliances. Water
vapor is a by-product of gas combustion, and as produced by
an unvented heater, can create moisture problems in homes,
when operated for extended periods of time. If high humidity is
experienced, a dehumidifier may be used to lower the water
vapor content of the air.
During manufacturing, fabrication, and shipping, various
components of this appliance are treated with certain oils,
films, or bonding agents. These chemicals ARE NOT harmful,
but may produce annoying smoke and smells, as they are
burned off, during the initial operation of the appliance. This
may possibly cause headaches, and eye or lung irritation. This
is a normal and temporary occurrence. The initial break-in
period should last three ( 3 ) to four ( 4 ). During this period,
provide maximum ventilation by opening a window or door, to
allow odors to dissipate. Any odor remaining after this initial
break-in period, will be slight and will disappear with continued
use.
6
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