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TABLE 7.1: SUMMARY OF HORIZONTAL VENTING OPTIONS
VENT OPTION # 1 2 3
CLASSIFICATION USED IN THIS
MANUAL
HORIZONTAL
CONCENTRIC
HORIZONTAL
TWIN PIPE
HORIZONTAL
CONCENTRIC
ILLUSTRATED IN FIGURE
7.2 7.3 7.2
VENT PIPE PENETRATION
THROUGH STRUCTURE
WALL WALL WALL
AIR INTAKE PIPE PENETRATION
THROUGH STRUCTURE
WALL WALL WALL
VENT PIPE SIZE
60/100 mm
CONCENTRIC
3”
80/125 mm
CONCENTRIC
AIR INTAKE PIPE SIZE
3”
MAXIMUM LENGTH
VENT
BWC070 32ft
55ft 55ft
BWC090 32ft
55ft 55ft
BWC120 18ft
55ft 55ft
INLET
BWC070 32ft
55ft 55ft
BWC090 32ft
55ft 55ft
BWC120 18ft
55ft 55ft
MINIMUM LENGTH
VENT
BWC070 10in
2ft 2ft
BWC090 10in
2ft 2ft
BWC120 10in
2ft 2ft
INLET
BWC070 10in
2ft 2ft
BWC090 10in
2ft 2ft
BWC120 10in
2ft 2ft
VENT TERMINAL
60/100 mm
CONCENTRIC
CROWN
#230511
Crown 230531
CONCENTRIC
or 230540
SNORKEL
AIR INTAKE TERMINAL 3” 90 ELBOW
VENT MATERIAL
CROWN
60/100mm
VENT
COMPONENTS
SHOWN IN
TABLE 7.4a
(Note #1)
APPROVED
STAINLESS
STEEL VENT
SYSTEM
SHOWN IN
TABLE 7.5
CROWN
80/125mm VENT
COMPONENTS
SHOWN IN
TABLE 7.4b
AIR INTAKE MATERIAL
GALVANIZED
OR PVC
Note #1: In Vent Option #1, the 80/125mm concentric straight section (PN 230515) shown in Table 7.4a may be used between the
boiler and the first 80/125 x 60/100 reducing elbow. If this is done, the overall maximum vent length is still restricted to that shown for
Vent Option #1 in Table 7.1 above.
Horizontal Terminal Clearance Requirements (continued):
• Vent terminal must be at least 6 feet from an inside corner.
• Under certain conditions, water in the flue gas may condense, and possibly freeze, on objects around the vent
terminal including on the structure itself. If these objects are subject to damage by flue gas condensate, they
should be moved or protected.
• If possible, install the vent and air intake terminals on a wall away from the prevailing wind. Reliable operation
of this boiler cannot be guaranteed if these terminals are subjected to winds in excess of 40 mph.
• Air intake terminal must not terminate in areas that might contain combustion air contaminates, such as near
swimming pools. See Section IV for more information on possible contaminates.