Combustion Air And Ventilation For Appliances In Unconfined Spaces; Combustion Air And Ventilation For Appliances In Confined Spaces - Maytag HX40NARS User Manual

Instructions for Installation (cont'd)
Locating the New Water Combustion Air and Ventilation
Heater (cont'd)
for Appliances Located in
Unconfined Spaces
A 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-ser-
rating of all appliances installed in that space. Rooms corn-
vice laundries with dry cleaning equipment, it is
municating 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
be installed so that combustion and ventilation air
be taken from outside these areas. Refer to the
considered a part of the unconfined space
"Locating The New Water Heater" section of this In unconfined spaces in buildlngs, in£dtration 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
AWARNING _
Appliances Located in Confined Spaces, b.
INSTALLATIONS IN AREAS WHERE FLAMMABLE LIQ-
UIDS (VAPORS) ARE LIKELYTO BE PRESENTOR STORED
(GARAGES, STORAGE, AND UTILITY AREAS, ETC):
Combustion Air and Ventilation
I Flammable liquids (such as gasoline, solvents, propane
for _____i. = Located in
(LP) or butane, etc.), all of which emit flammable
pp,,ances
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 Conl_ned 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 (See Page II Figure I, and Figure 2 below)
from the floor at least 18 inches. While this may
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 suffident volume so that the combined volume
open flame or spark producing appliance, of all spaces meets the criteria fur an unconfined space.
NOTE: Flammable vapors may be drawn by air currents The total input of all gas utifization equipment installed in
from other areas of the structure to the appliance, the combined space shall be considered in making this
determination. 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 commencing within 12 inches of the bottom of the
enclosure.
ASVENT
I
FUR OPENINGS
WATER
ER
II [I..J ^_--
IFigure21
12