Dunkirk DCC-150 Installation, Operation & Maintenance Manual page 32

FIGURE 6-14 -Twin Pipe Side Wall Vent
3" (76mm) Min.
24" (610mm) Max.
Separation
Opening
Separation 24"
Min.
See Grade,
Snow & Ice
12" (305mm) Min. horizontal separation

between combustion air intake and vent of
same appliance.
 12" (305mm) Min. 84" (2.2m) Max. vertical
separation between combustion air intake
and vent of different appliances.
 15" (381mm) Max. horizontal length of
vent.
Roof
 Min. vent/intake between different
Terminations
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 6-11.
6 - COMBUSTION AIR AND VENT PIPING
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
FIGURE 6-15 -Twin Pipe Side Wall with 45° Vent
3" (76mm) Min.
24" (610mm) Max.
Separation
Combustion Air, 90°
Elbow Downward
See Grade,
Snow & Ice
Maintain 12"(305mm) US, 18"(457mm)
Canada clearance above highest anticipated
snow level, 24" (610mm) above roof.
Grade, Snow
& Ice
Avoid locations where snow may drift and
block vent and combustion air. Ice or snow
may cause boiler to shut down if vent or
combustion air becomes obstructed.
FIGURE 6-16- Single Wall Exhaust Kit and Air Intake
Minimum Distance Center to Center
28
Vent
45° Elbow
Upward
12" (305mm) Min.
24" (610mm) Max.
Separation
Opening
Separation 24"
Min.
43/4"
[120mm]
240011947 REV B, [03/31/2018]