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FIGURE 1.11: EXPANSION LOOPS
TABLE 1.12: SUMMARY OF VERTICAL VENTING OPTIONS
VENT OPTION # 5 6 7 8
CLASSIFICATION USED IN THIS
MANUAL
VERTICAL
TWIN PIPE
VERTICAL
TWIN PIPE
VERTICAL
TWIN PIPE
VERTICAL
TWIN PIPE
ILLUSTRATED IN FIGURE 1.14 1.15 1.16 1.16
VENT PIPE PENETRATION
THROUGH STRUCTURE
ROOF ROOF ROOF ROOF
AIR INTAKE PIPE PENETRATION
THROUGH STRUCTURE
ROOF ROOF ROOF ROOF
VENT PIPE SIZE
3” 3”
3” 4”
AIR INTAKE PIPE SIZE
3” 3”
4” 4”
MAXIMUM LENGTH
VENT
BWC070 98ft 98ft
BWC090 98ft 98ft
BWC120 98ft 98ft
BWC151 98ft 98ft
BWC150
51ft
BWC225
49.5ft
INLET
BWC070 98ft 98ft
BWC090 98ft 98ft
BWC120 98ft 98ft
BWC151 98ft 98ft
BWC150
54.5ft
BWC225
54.5ft
MINIMUM LENGTH
VENT
BWC070 2ft 2ft
BWC090 2ft 2ft
BWC120 2ft 2ft
BWC151 2ft 2ft
BWC150
2ft
BWC225
2ft
INLET
BWC070 2ft 2ft
BWC090 2ft 2ft
BWC120 2ft 2ft
BWC151 2ft 2ft
BWC150 2ft
BWC225 2ft
VENT TERMINAL COUPLING
CROWN
PN 230873
CONCENTRIC
TERMINAL
COUPLING COUPLING
AIR INTAKE TERMINAL 180 ELBOW 180 ELBOW 180 ELBOW
VENT MATERIAL
CPVC + PVC
(Note #1)
CPVC + PVC
(Note #1)
CPVC + PVC
(Note #1)
CPVC + PVC
(Note #1)
AIR INTAKE MATERIAL PVC PVC PVC PVC
Note #1: First 30” and Elbow connected to boiler must be CPVC. Downstream vent pipe can be PVC, except as noted in text.