66
RECYCLING AND DISPOSAL
66
APPENDIX
APPENDIX
Vertical venting system (sealed combustion)
12
Vertical venting system (sealed combustion)
Flexible vent and
combustion air pipe
12
MULTIPLE BOILERS
When installing multiple air and vent terminations, be sure that:
− The clearance between the vent and air termination are in
accordance with the gures shown in this chapter
− All vent pipes and air inlets must terminate at the same
height
Concentric vent and combustion air vertical termination; X ≥
12" (305 mm); Y ≥ 12" (305 mm) (18" (457 mm) for Canada and/
or per CAN/CSA B149.1) above highest snow level. Maximum
24” above roof
Y
Concentric vent and combustion air horizontal termination; X
≥ 4” (102 mm); Y ≥ 24" (610 mm); Note: the terminations must
all be level with each other and at a 12" (305 mm) min from
grade or the snow line.
air intake
Vent
Y
X
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