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COMBUSTION AIR
PIPE (NON-DIRECT
VENT/1-PIPE)
VENT PIPE
HORIZONTAL TO ROOF
COMBUSTION AIR
PIPE (DIRECT VENT
/2-PIPE)
COMBUSTION AIR
PIPE (NON-DIRECT
VENT/1-PIPE)
VERTICAL TO ROOF
NOTE: A 12-in. (305 mm) minimum offset pipe section is recommended with
Vertical separation
between combustion
air and vent
8 3/4 in. (222mm)for 3 in. (76mm)ki t
6 3/4 in. (172mm)for 2 in. (51mm) ki t
Maintain 12 in. (305mm)min .
clearance above
highest anticipated
snow level
Maximum of 24 in.(614mm)
above roof
Fig. 42 - - Combustion Air and Vent Pipe Termination for Direct Vent (2-pipe) System
12 " MIN
(305 mm)
COMBUSTION AIR
PIPE (NON-DIRECT
12 " MIN
(305 mm)
short (5-ft. to 8-ft (1.5 to 2.4 M)) vent systems. This recommendation is
to reduce excessive condensate droplets from exiting the vent pipe
Fig. 41 - - Short Vent (5 to 8 ft (1.5 to 2.4 M)) System
Roof T e rmination (Preferred)
At least 36 in.
(914mm)
18 in. maximum
(457mm)
Note: "A" denotes 0 to < 2 in.
(51mm)
Between the first 2 vents
Third vent must be > 36 in. away
(914mm)
12
in.
overhang or roof
(typ)
90°
A
COMBUSTION AIR
PIPE (DIRECT VENT
/2-PIPE)
COMBUSTION AIR
PIPE (NON-DIRECT
VENT/1-PIPE)
VENT PIPE
HORIZONTAL TO SIDEWALL
VENT PIPE
VENT/1-PIPE)
VERTICAL TO SIDEWALL
Concentric Vent and Combustion Air
Roof Termination (preferred)
A
Abandoned masonry
used as raceway
(per code)
min from
A
At least 36 in.
in. (305mm)
12
(914mm)
separation between
Side wall termination
bottom ofcombustion air and
of less than 12
bottom of vent (typ)
Maintain 12
in.
(305mm)
min. clearance above
highest anticipated
snow level or grade
whichever is greater (typ)
- - 43 - -
12 " MIN
(305 mm)
COMBUSTION AIR
PIPE (DIRECT
VENT/2-PIPE)
COMBUSTION AIR
PIPE (DIRECT VENT
/2-PIPE)
12 " MIN
(305 mm)
VENT PIPE
.
A
At least
36 in.
Maintain 12
in.
(305mm)
min. clearance above
(914mm)
highest anticipated
snow level, maximum of
24 in. above roof
in. (25mm)
1
maximum (typ) from wall to inlet
12
in. (305mm)
overhang or roof
A
Maintain 12
min. clearance above
highest anticipated
snow level or grade
whichever is greater
Concentric Vent
and Combustion - Air
Side T e rmination
in. (305mm)
above highest snow level
A05094
minimum from
(305mm)
in.
A05090
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