UTICA BOILERS OLSSV-050 Installation, Operation & Maintenance Manual page 25

FIGURE 6-1 Two Pipe Roof Vent
12" (305mm) Min.
12" (205mm) Min.
or greater separation
84" (2134mm) Max.
is manufacturer
recommended
Vent
12" (305mm) US,
18" (458mm) Canada Min.
Above
Anticipated Snow Line
FIGURE 6-2 Two Pipe Side Wall Vent
3" (76mm) Min.
24" (610mm) Max.
Separation
Opening
Separation
24" Min.
See Snow &
Ice Page 26
FIGURE 6-3 Two Pipe Side Wall Vent (Multiple Appliances.
See Snow & Ice
Page 26
Combustion Air
6 - COMBUSTION AIR AND VENT PIPING
12" (205mm) Min.
15"
(381mm)
Max.
Combustion
Air
12"(305mm)Min.
From Overhang
12" (305mm) Min.
24" (610mm) Max.
Separation Between
Bottom Of
Combustion Air Intake
And Bottom Of Vent
Vent
Combustion Air
12" (305mm) Min.
Separation
Manuf. Recommends
Greater Separation
Vent
Roof Line
Roof
Terminations
Side Wall
Terminations
25
12" (205mm) Min. horizontal

separation between combustion air
intake and vent of same appliance.
 12" (205mm) Min. 84" (2134mm)
Max. vertical separation between
combustion air intake and vent of
different appliances.
 15" (381mm) Max. horizontal length
of vent.
 Min. vent/intake between different
appliances 12" (305mm).
 Max. allowable total vertical vent
length with outside exposure is 10
ft.(3.05m).
 Abandoned unused masonry
chimney may be used as chaseway
for combustion air and vent. Both
combustion air and vent pipe must
exit above top of chimney with
clearances as shown in figure 6-1.
 3" (76mm) Min. 24" (610mm) Max.
Separation horizontal separation
between combustion air intake and
vent terminations.
 12" (305mm) Min. vertical separation
between combustion air intake and
vent terminations.
 12" (305mm) 24" (610mm) Max.
Separation between bottom of
combustion air intake and bottom of
vent.
 Multiple terminations as shown in
6-1, and 6-3 must be a min. of 12"
(305mm) horizontally between vent of
one termination and air intake of next
appliance. Manufacturer recommends
greater separation.
 Max. allowable total outside exposure
vent length equals 10 ft. (3.05m).
 Maintain a pitch of 1/2" per ft.
(42mm/m) outside exposure back to
boiler to ensure proper condensate
drainage for horizontal runs.
P/N# 2400010616, Rev. F [10/26/2015]