U.S. Boiler Company K2, Installation Instructions Manual

Page: 31 / 108

31
105294-05 - 5/15
VII. Venting
C. Design Requirements Unique to Vertical Venting Systems (continued)
Table 7.14: Equivalent Length of Flex Pipe
Equivalent Length (ft)
Flex Vent (1 ft):
2” DuraVent PolyPro Flex 2.0 ft
2” Centrotherm InnoFlue Flex 2.0 ft
2” Selkirk Polyflue 2.0 ft
3” DuraVent PolyPro Flex 2.0 ft
3” Centrotherm InnoFlue Flex 2.3 ft
3” Selkirk Polyflue 2.3 ft
B-Vent Air Chase (1ft):
2” Flex Vent in 5” (or larger) B-Vent 1.0 ft
3” Flex Vent in 6” (or larger) B-Vent 1.0 ft
Note: Up to four 45 degree bends may be made in flex pipe or air chase.
These bends are not counted when figuring equivalent length.