Carrier Series 100 Installation, Start-Up, And Operating Instructions Manual page 39

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Roof Termination (Preferred)
At least 36 in.
Vertical separation
between combustion
air and vent
8 3/4 in. for 3 in. kit
18 in. maximum
6 3/4 in. for 2 in. kit
Maintain 12 in. min.
clearance above
highest anticipated
snow level
Maximum of 24 in.
above roof
Note: "A" denotes 0 to < 2 in.
90°
Fig. 42—Combustion Air and Vent Pipe Termination
for Direct Vent (2-pipe) System (All Sizes)
Roof Termination (Preferred)
Maintain 12 in.
minimum clearance
above highest anticipated
snow level maximum of
24 in. above roof.
90°
Side wall termination
with 2 elbows (preferred)
Fig. 43—Vent Pipe Termination for Non-Direct
Vent (1-pipe) System (Sizes 040 Through 120 Only)
A
Abandoned masonry
used as raceway
(per code)
in.
12 min from
overhang or roof
At least 36 in.
in.
12 separation
between bottom of
combustion air and
A
bottom of vent
in.
Maintain 12
min. clearance above
highest anticipated
snow level or grade
whichever is greater
Vent
Abandoned masonry
used as raceway
(per code)
6 in. minimum clearance
between wall and end of vent pipe.
10 in. maximum pipe length
12 in. min. from
overhang or roof
Maintain 12 in.
minimum clearance
above highest anticipated
snow level or grade
whichever is greater.
39
Concentric Vent and Combustion Air
Roof Termination (preferred)
A
At least
36 in.
Maintain 12
min. clearance above
highest anticipated
snow level, maximum of
24 in. above roof
Concentric Vent
and Combustion - Air
Side Termination
A
Side wall termination
in.
of less than 12
12 in. min. from
overhang or roof
Maintain 12 in.
minimum clearance
above highest anticipated
snow level or grade
whichever is greater
Sidewall Termination
with Straight Pipe (preferred)
in.
1 in. maximum (type)
in.
12 minimum from
overhang or roof
A
in.
Maintain 12
min. clearance above
highest anticipated
snow level or grade
whichever is greater
A05090
A05091