Figure 48 ] Combustion Air and Vent Pipe Termination for Direct Vent (2-Pipe) System
Roof Termination (Preferred)
VertJcat separation between
combustion air and vent
8 Y_ in (222mm) for 3 in.(76mm)
6 Y_in (172mm) for 2in. (51mm)\
Maintain 12 in (S05mm)
highest anticipated snow __
level maximum of 24 in.
(614mm) above roof
\\\\x
Note:
36 in. separation between
pairs of inlets only required
for direct vent systems
At least 36 in ............. • Note:
................ (914mm) ...... A" denotes O To 2 in (51 mm)
Between the first 2 vents Third
]A_ vent (and fourth vent, if used)
18 in. Maximum _ e '914mm)
\ _!_'5_rn!-_l Maintain 12 in. (3O5mm) mJn. Clearance
\\ _- maximum of 24 in. (614mm) above roof
s above highest anticipated snow level
I
U
Abandoned masonry used
as raceway (per code)
Roof Termination (preferred)
1 in. (25mm) maximum
(Typ) from wall to inlet
12 in. From Overhang
or roof (Typ.)
(914mm__
Maintain 12 in (3O5mm) min Clear
ance above highest anticipated snow
level or grade whichever is greater
(Typ.)
Side wall termination of
less than 12 in (SO5mm)
above highest snow level
(g14mm)
(g14mm)
12 in. (3O5mm) separation
between bottom of corn
bustion air and bottom of
vent (Typ.)
..... Maintain 12 in (3O5mm) min.
Clearance abo_e highest an
ticipated snow level or grade
whichever is greater (Typ.)
Note:
in. "A" denotes O To 2 in (51 mm)
Between the first 2 vents Third
vent (and fourth vent, if used) must
be 36 in. Away (g14mm)
L12F044
Figure 49
IVent Pipe Termination for Non-Direct Vent and Ventilated Combustion Air System
RoofTermination (Preferred)
',305mm)
minimum clearance
above highest anticipated
snow level maximum of
24 in (610ram) above roof
Abandoned mas0nry
used as raceway
(per code)
6 in (152ram) minimum clearance
between wall and end of vent pipe
10 in (254mm) maximum pipe lengh
Side wall termination
with 2 elbows (preferred)
12 in (305 ram) rain from
overhang or roof
Maintain 12 in (305mm)
minimum clearance
above highest anticipated
snow level or grade
whichever is greater
305mm)
ighest anticipated
snow level or grade
whichever is greater
Sidewall Termination
with Straight Pipe (preferred)
A0509t
42 Specifications subject to change without notice. 440 01 4001 08
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