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VENTILATION LOUVERS
OUTLET
HEATER
"FURNACE
iNLET AiR DUCT
{ENDS 1' OR 30 cm
ABOVE FLOOR)
FIGURE 12.
When communicating with the outdoors through horizontal
ducts, each opening shall have a minimum free area of 1
square inch per 2,000 BTU per hour (11 cm2/kW) of total
input rating of all equipment in the enclosure. See
Figure 13.
When ducts are used, they shall be of the same cross-
sectional area as the free area of the openings to which they
connect. The minimum short side dimension of rectangular
air ducts shall not be less than 3 inches
(76.2 mm). See Figure 13.
_i__ a_ CHIMNEY OR GAS VENT
__W_ _ OUTLET AIR DUCT
FURNA II
FIGURE 13.
Louvers and Grilles: In calculating free area, consideration
shall be given to the blocking effect of louvers, grilles or
screens protecting openings. Screens used shall not be
smaller than 1/4 inch (6.4 mm) mesh. If the free area through
a design of louver or grille is known, it should be used in
calculating the size opening required to provide the free area
specified. If the design and free area is not known, it may be
assumed that wood louvers will be 20-25 percent free area
and metal louvers and grilles will have 60-75 percent free
area. Louvers and grilles shall be fixed in the open position
or interlocked with the equipment so that they are opened
automatically during equipment operation.
Special Conditions Created by Mechanical Exhausting or
Fireplaces: operation of exhaust fans, ventilation systems,
clothes dryers or fireplaces may create conditions requiring
special attention to avoid unsatisfactory operation of installed
gas utilization equipment.
Water Piping
Water temperature over 125°F
(52°C) can cause severe burns
instantly resulting in severe injury
or death.
Children, elderly, and the
physically or mentally disabled
are at highest riskfor scald injury.
Feel water before bathing or
showering.
Temperature limiting valves are
available.
Read instruction manual for safe
temperature setting.
HOTTER WATER CAN SCALD:
Water heaters are intended to produce hot water. Water heated
to a temperature which will satisfy space heating, clothes
washing, dish washing, cleaning and other sanitizing needs
can scald and permanently injure you upon contact. Some
people are more likely to be permanently injured by hot water
than others. These include the elderly, children, the infirm, or
physically/mentally handicapped. If anyone using hot water in
your home fits into one of these groups or if there is a local
code or state law requiring a certain temperature water at the
hot water tap, then you must take special precautions. In
addition to using the lowest possible temperature setting that
satisfies your hot water needs, a means such as a *mixing
valve, shall be used at the hot water taps used by these people
or at the water heater. Mixing valves are available at plumbing
supply or hardware stores. See Figure 14. Valves for reducing
point of use temperature by mixing cold and hot water are also
available. Follow manufacturer's instructions for installation of
the valves. Before changing the factory setting on the
thermostat, read the Temperature Regulation section in this
manual.
HOT WATER _ COLD WATER
OUTLET ] IN__LET
TEMPERE[_o
WATER OUTLET
LD WATER
T iNLET ON
ERb. ' WA%.EATER
*MIXING HOT WATER
VALVE OUTLET ON
WATER HEATER
RGURE 14,
Toxic Chemical Hazard
• Do not connect to non-potable water system.
12