Bosch 250SX LP Manual page 12

Appliance details
Room sealed installation (TWIN PIPE SYSTEM)
Fig. 12
Combustion air pipe: ≤ 26 ft (8 m)
Exhaust vent pipe: ≤ 26 ft (8 m)
If the total horizontal exhaust vent length in a side wall
installation is greater than or equal to 5 feet (1.5m), a
condensate drain tube must be attached to the exhaust
collar. See page 14.
Fig. 13
Combustion air pipe: ≤ 26 ft (8 m)
Exhaust vent pipe: A+B+C ≤ 23½ ft (7.2 m)
A condensate drain tube must be attached to the
exhaust collar of the heater for any vertically exhausted
vents, see page 14.
Note: reduce 2½ ft for each 90° elbow used after the
first one, reduce 1 ¼ ft for each 45° elbow.
A maximum of three 90-degree elbows are permitted.
The exhaust vent pipe and combustion air
i
pipe can be run vertically or horizontally.
Maximum length for each individual pipe is
26 feet (8 m) with one elbow, for each
additional 90° elbow after the first elbow
you must reduce 2½ feet from the total
vent length, or 1 ¼ feet for each 45°
elbow.
12
Open combustion installation (SINGLE PIPE
SYSTEM)
Fig. 14
Exhaust vent pipe: ≤ 26 ft (8 m)
If the total horizontal exhaust vent length in a side wall
installation is greater than or equal to 5 feet (1.5m), a
condensate drain tube must be attached to the exhaust
collar. See page 14.
Fig. 15
Exhaust vent pipe: A+B+C ≤ 23½ ft (7.2 m)
A condensate drain tube must be attached to the
exhaust collar of the heater for any vertically exhausted
vents, see page 14.
The exhaust vent system must vent directly to the
outside of the building and an adequate amount of
indoor combustion air must be provided for this
installation. See chapter 2.8.
Connecting a one piece 90 degree elbow pipe to the
combustion air inlet adaptor is necessary, this will
prevent debris or objects from ever falling into the inlet
opening.
Note: reduce 2½ ft for each elbow used after the first
one, reduce 1 ¼ ft for each 45° elbow.
A maximum of three 90-degree elbows are permitted.
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