Bosch C1050ES, Installation Manual

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Installation instructions
Maximum combustion air and exhaust pipe
length
The following tables display the maximum allowable
straight pipe lengths for combustion air and exhaust
piping with consideration to the number of elbows
used. Reduce the equivalent length for each elbow
used from the maximum allowable length depending on
the system used. Refer to table 5 if using 3" diameter
venting. Refer to table 6 if using 4" diameter venting.
Use of elbows
It is recommended to limit the amount of elbows used in
the exhaust and combustion air piping to reduce friction
in the air flow. The following lists the maximum amount
of 90° elbows allowed in either the exhaust or combus-
tion air piping:
3"
Venting
Maximum
allowable
Exhaust
pipe length
Maximum
allowable
Combustion
air pipe
length Elbow
Equivalency
90° 45°
Twin pipe
system
31ft 31ft 5 ft 3 ft
Concen-
tric system
23ft 23ft 5 ft 3 ft
Table 5 Maximum Allowable Exhaust and Combustion
Air Lengths for 3" venting
4"
Venting
Maximum
allowable
Exhaust
pipe length
Maximum
allowable
Combustion
air pipe
length Elbow
Equivalency
90° 45°
Twin pipe
system
63ft 63ft
2.5ft 1.5ft
Concen-
tric system
43ft 43ft
2.5ft 1.5ft
Table 6 Maximum Allowable Exhaust and Combustion
Air Lengths for 4" venting
Max. number of 90°
elbows 3"
venting
4"
venting
Twin pipe system 5 7
Concentric system 4 7
Table 7
i
Two 45° elbows are equal to one 90°
elbow. Any combination of 45° and
90° elbows may be used in the vent
system as long as the combination
does not exceed the maximum listed
in table 7 above.