ECR International UTICA BOILERS MAC-150 Manuel D'installation, D'utilisation Et D'entretien page 88

Fig. 1 -Two Pipe Roof Vent
12" (205mm) Min.
Vent
12" (305mm) US,
18" (458mm) Canada
Min. Above
Anticipated Snow Line
Fig. 2 -Two Pipe Side Wall Vent
3" (76mm) Min.
24" (610mm) Max.
Separation
Opening
Separation 24"
Min.
See Grade,
Snow & Ice
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.
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 1.
240011317 REV D, (07/30/16)
APPENDIX - A Approved Termination Options
15"
(381mm)
Max.
Roof Line
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
Fig. 3 -Two Pipe Side Wall Vent (Multiple Appliances)
See Grade,
Snow & Ice
Combustion Air
Fig. 4 -Two Pipe Side Wall with 45° Vent
3" (76mm) Min.
24" (610mm) Max.
Separation
Combustion Air, 90°
Elbow Downward
See Grade,
Snow & Ice
Grade, Snow
& Ice
88
12" (305mm) Min.
Separation
Manufacturer Recommends
Greater Separation
Vent
12" (205mm) Min.
24" (610mm) Max.
Opening
Separation 24"
Min.
Maintain 12"(305mm) US, 18"(457mm)
Canada clearance above highest anticipated
snow level, 24" (610mm) above roof.
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.
Vent
45° Elbow
Upward
Separation