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Instructions for Installation (cont'd)
Mustmaintain
adequateservice
/- .......... "--..
and maintenance
//
",
any9" min.overhangfrOm
accessibility. _
_:
",,,
otF,oe
12"rnin.
F gure 4
'
Rankle of degrees
I
I
""
,/
availablefor vent
""_ .............""
pipe installation.
I
i
Venting Through Roof- Clearances
I
I
• 0" clearance for 3" (or optional 2" and 4") PVC, ABS, or
Figure 2 ,
_
CPVC Schedule 40 piping from combustible surfaces.
m
inches above the roof surface. Figure 5.
"-
• The location selection must provide clearances for servicing
and proper operation of the water heater. Figure 4.
• The venting system must be installed in a manner which
allows inspection of the installation of the venting pipes and
IFLESS THAN
joints as well as periodic inspection after installation as
48"
_
k_L-.,_,-_.,,_
required by AN SI Standards.
w,.REE. / '°°"EE'ELL
TP-EOR_ER V ENT
I FigUF"
3¢_ IIiUmin"
__,_
FO_NC_DALR_LET
_'r'
_:_
POWER VENT TERMINAL _
_-
-
" --
'\
- _NATURAL DRAFT (GRAVITY)
O,RE VENT.
POWERVE.T.
Combustion Air and Ventilation
ORPOWERO,RE VE T for AppliancesLocatedin
_-=-
APPLIANCE I NLET AND/OR
\_
-- OUTLETVENT(S),
Confined
Spaces
I Figure 3111
Unconfined Space is a space whose volume is not less than
50 cubic feet per 1,000 Btu per hour of the aggregate input
rating of all appliances installed in that space. Rooms com-
municating directly with the space in which the appliances are
vent t erminal 18" to wallorother
obstructions
thatmay
installed, through openings not furnished with doors, are
interfere
with
venting.
considered a part of the unconfined space
I_
18" rnin._
In unconfined spaces in buildings, infiltration may be ade-
quate to provide air for combustion, ventilation and dilution
_
/_
vent
terminal
of flue gases. However, in buildings of tight construction (for
1
example, weather stripping, heavily insulated, caulked, vapor
Figure3Cj
m" .
corner
ofbuildina
barrier, etc.), additional air may need to be provided using the
methods described in Combustion Air and Ventilation for
Appliances Located in Confined Spaces, b.
12
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