Multiple Boiler - Bosch SSB255 Installation And Service Manual

32 | Installation
Fig. 40 Vertical venting system (sealed combustion)
Fig. 41 Vertical venting system (sealed combustion)
6720818454 (2016/02) US
2 1
Flexible vent and
combustion air pipe
2 1
4 .7 .6

Multiple boiler

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 inlet must terminate at the same height
Y
Fig. 42 Concentric vent and combustion air vertical termination; X ≥ 12"
; Y ≥ 12" (18" for Canada and/or per CAN/CSA B149.1) above
highest snow level. Maximum 24" above roof
X
Fig. 43 Concentric vent and combustion air horizontal termination;
X ≥ 1" min or 2"max; Y ≥ 24"; Note: the level of the termination
must be the same at 12" min from grade or snow line
Vent
Air intake
Fig. 44 Multiple air and vent vertical termination; X ≥ 12"; Y≥ 12"
X
Combustion
air intake
Vent
Y
Air intake Vent
Y
X
SSB