Fresh Air Opening For Con Ned Spa Es; Outdoor Air Through Two Openings; Outdoor Air Through One Opening; Outdoor Air Through Two Horizontal Du Ts - A.O. Smith 104 Series Instruction Manual

FRESH AIR OPENINGS FOR CONFINED SPACES
The following instru tions shall be used to al ulate the size,
number and pla ement of openings providing fresh air for
ombustion, ventilation and dilution in
illustrations shown in this se tion of the manual are a referen e
for the openings that provide fresh air into on ned spa es
only DO NOT refer to these illustrations for the purpose of vent
installation See Venting Installation on page 16 for omplete
venting installation instru tions

OUTDOOR AIR THROUGH TWO OPENINGS

FIGURE 12.
The on ned spa e shall be provided with two permanent
openings, one ommen ing within 12 in hes (300 mm) of the top
and one ommen ing within 12 in hes (300 mm) of the bottom of
the en losure The openings shall ommuni ate dire tly with the
outdoors See Figure 12
Ea h opening shall have a minimum free area of 1 square in h
per 4,000 Btu/hr (550 mm
2
of all applian es installed in the en losure Ea h opening shall
not be less than 100 square in hes (645 m

OUTDOOR AIR THROUGH ONE OPENING

FIGURE 13.
on ned spa es The
per kW) of the aggregate input rating
)
2
Alternatively a single permanent opening,
within 12 in hes (300 mm) of the top of the en losure,
shall be provided See Figure 12 The water heater shall
have learan es of at least 1 in h (25 mm) from the sides
and ba k and 6 in hes (l50 mm) from the front of the
water heater The opening shall dire tly
with the outdoors or shall ommuni ate through a verti al
or horizontal du t to the outdoors or spa es that freely
ommuni ate with the outdoors and shall have a minimum
free area of the following
1 1 square in h per 3000 Btu/hr (733 mm
the total input rating of all applian es lo ated in the
en losure, and
2 Not less than the sum of the areas of all vent onne tors
in the spa e
OUTDOOR AIR THROUGH TWO HORIZONTAL DUCTS
The onfined spa e shall be provided with two permanent
horizontal du ts, one
mm) of the top and one
(300 mm) of the bottom of the en losure The horizontal
du ts shall ommuni ate dire tly with the outdoors See
Figure 14
Ea h du t opening shall have a minimum free area of
1 square in h per 2,000 Btu/hr (1100 mm2 per kW) of
the aggregate input rating of all applian es installed in
the en losure
When du ts are used, they shall be of the same
se tional area as the free area of the openings to whi h
they onne t The minimum dimension of re tangular air
du ts shall be not less than 3 in hes
17
ommen ing
ommuni ate
per kW) of
2
FIGURE 14.
ommen ing within 12 in hes (300
ommen ing within 12 in hes
ross