Carrier 58UVB series Installation, Start-Up, And Operating Instructions Manual page 25

COMBUSTION-AIR PIPE
VERTICAL TO ROOF
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.
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.
Between the first 2 vents
Third vent must be > 36 in. away
90°
Fig. 31 --- Combustion Air and Vent Pipe Termination
VENT PIPE
12 " MIN
Fig. 30 --- Short Vent (5 to 8 Ft) System
Roof Termination (Preferred)
At least 36 in.
A
Abandoned masonry
used as raceway
(per code)
in.
12 min from
overhang or roof
(typ)
12 in.
between bottom of
combustion air and
A
bottom of vent (typ)
Maintain 12
min. clearance above
highest anticipated
snow level or grade
whichever is greater (typ)
for Direct Vent (2- -pipe) System (All Sizes)
25
COMBUSTION-AIR PIPE
12 " MIN
VENT PIPE
VERTICAL TO SIDEWALL
Concentric Vent and Combustion Air
Roof Termination (preferred)
At least
36 in.
A
At least 36 in.
separation
Side wall termination
of less than 12 in. above highest snow level
in.
A06356
A
in.
Maintain 12
min. clearance above
highest anticipated
snow level, maximum of
24 in. above roof
in.
1 maximum (typ) from wall to inlet
in.
12 minimum from
overhang or roof
A
in.
Maintain 12
min. clearance above
highest anticipated
snow level or grade
whichever is greater
Concentric Vent
and Combustion - Air
Side Termination
A05090