Bosch SSB255 - Multiple Boiler

6720818454 (2016/02) US SSB
32 | Installation
Fig. 40 Vertical venting system (sealed combustion)
Fig. 41 Vertical venting system (sealed combustion)
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 gures shown in this chapter
• All vent pipes and air inlet must terminate at the same height
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
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
Fig. 44 Multiple air and vent vertical termination; X ≥ 12”; Y≥ 12”
2 1
2 1
Flexible vent and
combustion air pipe
X
Y
Y
X
Vent
Combustion
air intake
Air intake
Air intake
Vent
X
Y
Vent