25
VERTICAL TO SIDEWALL
VERTICAL TO ROOF
COMBUSTION-AIR PIPE
VENT PIPE
COMBUSTION-AIR PIPE
VENT PIPE
12
″
MIN
12
″
MIN
NOTE
: A 12 In. minimum offset pipe section is recommended with
short (5 to 8 ft) vent systems. This recommendation is to reduce
excessive condensate droplets from exiting the vent pipe.
A06356
Fig. 30
---
Short Vent (5 to 8 Ft) System
At least 36 in.
18 in. maximum
Vertical separation
between combustion
air and vent
8 3/4 in. for 3 in. kit
6 3/4 in. for 2 in. kit
Roof Termination (Preferred)
Abandoned masonry
used as raceway
(per code)
At least
36 in.
A
Maintain 12
in.
min. clearance above
highest anticipated
snow level, maximum of
24 in. above roof
Concentric Vent and Combustion Air
Roof Termination (preferred)
1
in.
maximum (typ) from wall to inlet
12
in.
minimum from
overhang or roof
Maintain 12
in.
min. clearance above
highest anticipated
snow level or grade
whichever is greater
A
At lea
st
36
in.
Concentric Vent
and Combustion - Air
Side Termination
A
At least 36 in.
Side wall termination
of less than 12
in.
above highest snow level
12
in.
min from
overhang or roof
12
in.
separation
between bottom of
combustion air and
bottom of vent (typ)
Maintain 12
in.
min. clearance above
highest anticipated
snow level or grade
whichever is greater (typ)
A
At least 36 in
.
A
Maintain 12 in. min.
clearance above
highest anticipated
snow level
Maximum of 24 in.
above roof
90
°
Note:
"A" denotes 0 to < 2 in.
Between the first 2 vents
Third vent must be > 36 in. away
(typ)
A05090
Fig. 31
---
Combustion Air and Vent Pipe Termination
for Direct Vent (2--pipe) System (All Sizes)
58U
VB