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Instructions for Installation (cont'd)
Locating the New Water Combustion Air and Ventilation
Heater (cont'd) for Appliances Located in
Unconfined Spaces
&WARNING Unconfined Space is a space whose volume is not less than
If this water heater will be used in beauty shops, 50 cubic feet per 1,000 Btu per hour of the aggregate input
barber shops, cleaning establishments, or self-serv- rating of all appliances installed in that space. Rooms com
ice laundries with dry cleaning equipment, it is mnnicating directly with the space in which the appliances are
imperative that the water heater or water heaters installed, through openings not furnished with doors, are con-
be installed so that combustion and ventilation air
be taken from outside these areas. Refer to the sidered a part of the unconfined space
"Locating The New Water Heater" section of this In unconfined spaces in buildings, infiltration may be ade-
manual and also the latest edition of the National quate to provide air for combustion, ventilation and dilution
Fuel Gas Code, ANSI Z223.1, also referred to as NFPA
54 for specifics provided concerning air required, of flue gases. However, in buildings of tight construction (for
example weather stripping heavily insulated, caulked, vapor
barrier, etc.), additional air may need to be provided using the
methods described in Combustion Air and Ventilation for
&WARNING Appliances Located in Confined Spaces, b.
INSTALLATIONS IN AREAS WHERE FLAMMABLE LIQ-]
UIDS(VAPORS)ARE LIKELYTO BEPRESENTOR STORED[
(GARAGES, STORAGE, AND UTILITY AREAS, ETC): I Combustion Air and Ventilation
Flammable liquids (such as gasoline, solvents, propane I
for
A__ __ I-i
Located in
(LP) or butane, etc.), all of which emit flammable I /ppllances
vapors, may be improperly stored or used in such
Confined
areas. The gas water heater pilot light or main burner =paces
can ignite such vapors. The resulting flashback and fire Confined Space is a space whose volume is less than 50 cubic
can cause death or serious burns to anyone in the
area, as well as property damage, feet per 1,000 Btu per hour of the aggregate input rating of all
If installation in such areas is your only option, then appliances installed in that space.
the installation must be accomplished in a way that a. ALL AIR FROM INSIDE BUILDINGS:
the pilot flame and main burner flame are elevated
from the floor at least 18 inches. While this may (See Page 10 Figure 1, and Figure 2 below)
reduce the chances of flammable vapors from a floor The confined space shall be provided with two permanent
spill being ignited, gasoline and other flammable sub- openings communicating directly with an additional
stances should never be stored or used in the same
room or area containing a gas water heater or other room(s) of sufficient volume so that the combined volume
open flame or spark producing appliance, of all spaces meets the criteria for an unconfined space. The
NOTE: Flammable vapors may be drawn by air currents total input of an gas utilization equipment installed in the
from other areas of the structure to the appliance, combined space shall be considered in making this deter-
mination. Each opening shall have a minimum free area of
one square inch per 1,000 BTU per hour of the total input
rating of all gas utilization equipment in the confined
space, but not less than 100 square inches. One opening
shall commence within 12 inches of the top and one com-
mencing within 12 inches of the bottom of the enclosure.
-,,4_ CHIMNEYOR GAS VENT
FUR OPENINQ8
W/_TER
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[ Figure 2 ]
11