Riello Array AR 399 SE Installation, Operation And Service Manual page 66

APPENDIX
APPENDIX RECYCLING AND DISPOSAL
Vertical venting system (sealed combustion)
Vertical venting system (sealed combustion)
2 1
Flexible vent and
combustion air pipe
2 1
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 figures 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
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.
X
66 66
X
Combustion
air intake
Vent