Rinnai I Series, Installation And Operation Manual, Page: 36 / 136

36 Rinnai I - Series Condensing Boiler Combi Manual
Twin Pipe Vertical Termination
of Multiple Boilers
12 in. (0.30 m) minimum
12 in. (0.30 m)
minimum
above
combustion air
opening
Roof
12 in. (0.30 m) above
grade or anticipated
snow level
12 in. (0.30 m)
minimum
Combustion
Air
Exhaust
Vent Sizes:
•
2 in. PVC
•
2 in. (60 mm) PP
•
3 in. PVC
•
3 in. (80 mm) PP
Vent Lengths: 65 ft (20 m) 150 ft (46 m)
•
45° elbow is equivalent to 3 ft (1 m)
•
90° elbow is equivalent to 6 ft (2 m)
ACCEPTABLE ACCEPTABLE NOT ACCEPTABLE
90° Elbows,
Long Sweep
90° Elbows,
Short Sweep
90° Elbows,
Close Turn
Vent length includes the additional venting, fittings
and terminations.
Tee Sidewall
12”
4”
Combustion
Air
Exhaust
8”
Horizontal Vent and
Combustion Air Piping
Intake vent installation not
permitted in shaded area.
60 in.
9 in.
8 in.
Ground
12”
36 in. minimum
clearance from intake
to grade, ground, or
anticipated snow level.
X
X
X
X
X X
V
X
X
V = Exhaust Vent
X = Air Inlet
60 in.