Installation Instructions

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

Flexible vent and

combustion air pipe

Vent

Combustion

air intake

Air intake

Vent