Dunkirk GWB9-050IH-2, Installation Instructions Manual

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Figure 18 - Combustion Air and Vent Piping - Boiler Connections
COMBUSTION AIR AND VENT PIPE
2” (50.8mm) DIAMETER VENT AND
COMBUSTION AIR INTAKE PIPING
- 21 feet maximum total equivalent
length for 90-100 models
-26 feet maximum total equivalent
length for 90-50 and -90-75 models
- 2 feet minimum total equivalent
length for all models
TRANSITION FITTING
2” (50.8mm)
⊘
to 3” (76.2mm)
⊘
IN VERTICAL RUN
3” (76.2mm) DIAMETER VENT AND
COMBUSTION AIR INTAKE PIPING
- 92 feet maximum total equivalent length
for 90-100 models
- 15 feet minimum total equivalent length
for 90-100 models
- 112 feet maximum total equivalent length
for 90-50 and 90-75 models
- 20 feet minimum total equivalent length
for 90-50 and 90-75 models