Lennox International Inc Gas-Fired Hot Water Boiler, GWB9-075IH-2, GWB9-100IH-2, GWB9-050IH-2

Figure 18 - Combustion Air and Vent Piping - Boiler Connections

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