Style selections SSD24TR - Water Vapor; Producing Adequate Ventilation; Confined and Unconfined Space; Air for Combustion and Ventilation

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IMPORTANT SAFETY INFORMATION
WATER VAPOR: A BY-PRODUCT OF UNVENTED ROOM HEATERS
Water vapor is a by-product of gas combustion. An unvented room heater produces
approximately one (1) ounce (30 mL) of water for every 1,000 BTUs (.3KW) of gas
input per hour. Unvented room heaters are recommended as supplemental heat (a
room) rather than a primary heat source (an entire house). In most supplemental heat
applications, the water vapor does not create a problem. In most applications, the water
vapor enhances the low humidity atmosphere experienced during cold weather.
The following steps will help insure that water vapor does not become a problem:
1. Be
sure the heater is sized properly for the application, including ample combustion
air and circulation air.
2.
Ifhighhumidityisexperienced,adehumidiermaybeusedtohelplowerthewater
vapor content of the air.
3. Do not use an unvented room heater as the primary heat source.
PRODUCING ADEQUATE VENTILATION
The following are excerpts from National Fuel Gas Code. NFPA 54/ANS Z223.1. Air
for Combustion and Ventilation. All spaces in homes fall into one of the three following
ventilationclassications:
1. Unusually
Tight Construction
2. UnconnedSpace
3. ConnedSpace
The information on pages 7 through 9 will help you classify your space and provide
adequate ventilation.
Conned and Unconned Space
TheNationalFuelGasCode,ANSZ223.1denesaconnedspaceasaspacewhose
volume is less than 50 cu. ft. per 1,000 BTU/hr (4.8 m^3 per kw) of the aggregate input
ratingofallappliancesinstalledinthatspaceandanunconningspaceasaspace
whose volume is not less than 50 cu. ft. per 1,000 BTU/hr (4.8 m^3 per 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unconnedspace.
Thisheatershallnotbeinstalledinaconnedspaceorunusuallytightconstruction
unless provisions are provided for adequate combustion and ventilation air.
* Adjoining rooms are connecting only if there are doorless passageways or ventilation grills
between them.
WARNING:Thisheatershallnotbeinstalledinaconnedspaceorunusuallytight
construction unless provisions are provided for adequate combustion and ventilation
air. Read the following instructions to ensure proper fresh air for this and other fuel-
burning appliances in your home.
AIR FOR COMBUSTION AND VENTILATION