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Vertical
separation
between
combustion
air and vent
8 V4 in. (222mm)
tot 3 in. (76ram)
6 V_ in. (172ram)
for 2 in. (51ram)
\
Maintain
12 in. (305ram)
min. Clearance
above
highest
anticipated
snow
__
level maximum
of 24 Jn
(614mm)
above
roof
Roof Termination
(Preferred)
A [east 36
n
...............
.........
914mm
.........
t8 in. Maximum
Note:
"A" denotes
0 To 2 in. (51ram)
Note:
36-in,
separation
between
pairs
of inlets
only required
for direct-vent
systems
i
I4A_
vBee_teenndthfe_
2vVetntsfThisred d
.....................
R
£
must be 36 in, Away
914mm
..... A........
' _
-
kf]east
36
_
_
Maintain
12 in, (305ram)
rain. Clearance
- --4i ....
!_\
_
_--
above highest anticipated
snow
evel
111"
r_
t9t4mm)
?
:._-
rnaxi .....
f 24 in. (614mm) ab ......
f
"
i |
_
"
Concentric
Vent
and Combustion
Air
1
,
Roof
Termination
(preferred)
t in (25ram)
maximum
(Typ,) from wal_ to inlet
12 in, From Overhang
or roof
(Typ.)
Maintain
I2 in. (305mm)
rain. Clear-
"__
ance above highest
anticipated
snow
(91 4ram}
leveJ or grade
whichever
is greater
-
--
-
-
(Typ.)
Side wall termination
of
bess than
12 in. (305mm)
above highest
snow
level
Note:
"A" denotes
0 To 2 in. (51 ram)
Between
the first 2 vents
Third
vent (and fourth vent, if used) must
be 36 in. Away
(914mm)
Clearance
above highest
an-
ticipated
snow
level or grade
whichever
is greater
(Typ,)
Fig. 48 - Combustion
Air and Vent Pipe Termination
for Direct Vent (2-Pipe)
System
A13305
Roof
Termination
(Preferred)
cr_ 305ram)
mnmum
earance
above
highest
a_licipated
snow
level maximum
of
24 in (610mm)
above
roof
.°[ ............
," ]2_;
Abandoned
masonry
used as raceway
(percode)
12 in
rain
(305 mm)fron
overhang
or roof
6 in
(152ram)
minimum
clearance
between
wall
aid
end of vent
pipe
10 in
(254mm)
maximum
pipe
len qh
Side walltermination
with
2 elbows
(preferred)
12 in
(305 ram)
rain from
overhang
or roof
Maintain
12 in
(305mm)
minimum
clearance
above
highest
a_licipated
snow
level
or grade
whichever
is greater
_O5mm)
ghest
anticipated
snow
level or grade
whichever
is greater
Sidewall
Termination
with
Straight
Pipe (preferred)
Fig. 49 - Vent Pipe Termination
for Non-Direct
Vent and Ventilated
Combustion
Air System
A05091
53
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