Bosch PROTANKLESS GWH 345/450 ESR - Manual (Page 22)

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Installation instructions
3.6.7 Exhaust vent configuration examples
Fig. 22 Horizontal side wall venting installation
Fig. 23 Vertical venting installation - Masonry
Chimney
Fig. 24 Vertical venting installation
NOTE: If appliance uses room air, do not place any
other combustion appliance in the same space, to avoid
depressurizing of the building and winter freeze-up. Use
room sealed operation instead.