ECR International Utica Boilers UB90-50 Installation, Operation & Maintenance Manual page 27

Figure 18 - Combustion Air and Vent Piping - Boiler Connections
SAFETY RELIEF
VALVE SEE
PAGE 18 FOR
REQUIREMENTS
SAFETY RELIEF
VALVE SEE
PAGE 18 FOR
REQUIREMENTS
COMBUSTION AIR AND VENT PIPE
27
2" (50.8mm) Diameter Vent And Combustion
Air Intake Piping
- 21 ft (6.4m)maximum total equivalent length
for 90-100 models
-26 ft (7.9m) maximum total equivalent length
for 90-50 and -90-75 models
- 2 ft (0.6m) minimum total equivalent length
for all models
2" (50.8mm) ⊘ to 3" (76.2mm)
TRANSITION FITTING
⊘ IN VERTICAL RUN
3" (76.2mm) Diameter Vent And Combustion
Air Intake Piping
- 92 ft (28m) maximum total equivalent length
for 90-100 models
- 15 ft (4.6m) minimum total equivalent length
for 90-100 models
- 112 ft (34m) maximum total equivalent
length for 90-50 and 90-75 models
- 20 ft. (6m) minimum total equivalent length
for 90-50 and 90-75 models
P/N 240010135 Rev. D [04/15/2017]