Warning: Do not reduce the vent
(exhaust and combustion) pipe sizes
and do not common vent with any other
vented appliance or stove.
Warning: Failure to vent the exhaust
gases to the outside with sealed
stainless steel vent pipe (AL29-4C)
may result in dangerous flue gases
filling the space in which it is installed.
Warning: Do not mix vent pipe or
joining methods from different
Table 2 Terminals/Adapters Part Numbers
Caution: The vent system must be
installed by a qualified agency in
accordance with these instructions. If
condition such as explosion or Carbon
Bosch Water Heating will not be
responsible for improperly installed
Establish vent clearances that comply with the vent
manufacturer's specifications. In all cases follow local
codes. See Table 3.
Table 3 Venting Specifications
The appliance should be located as close to the point
of termination as possible. The maximum vent length is
39 feet (12 m) with one 90 degree elbow. Subtract
feet from the total vent length for each additional 90°
elbow used (a maximum of four 90° elbows are
permitted in the total vent length), or subtract
every 45° elbow used. Horizontal sections of vent must
6 720 607 915
PVC or any other
rigid or semi rigid
sealed 3 pipe
pitch ¼" for every foot of horizontal length, to prevent
the pooling of condensate, and be supported at 4 foot
intervals with overhead hangers.
Note: Listed thimbles or collars are necessary to pass
through wall and ceiling partitions. If the vent system
passes through combustible areas where the vent
clearance requirements cannot be maintained, it is
permissible to chase straight sections of sealed 3 inch
single wall vent through 4 inch (or greater) Type-B vent.
The distance to combustibles using this chase
technique is 1 inch. Note: Type-B vent should never
be used as the actual exhaust vent system for the
appliance, as it is not gas tight.
Minimum exhaust vent size and length
Maximum exhaust vent and combustion air inlet
ft for each 90° elbow used after the first
ft for each 45° elbow.
Exhaust vent conditions
Caution: Any horizontal flue system
fitted to the appliance must incline
towards the appliance at an angle of
3% to prevente condensate dripping
from the flue terminal.
The minimum exhaust vent length is
The use of a 90 degree elbow is
ft in vent length.
The use of 45 degree elbow is
ft in vent length.