Bosch C 1210 ES Installation Manual page 13

Calculation example for 3" venting:
Exhaust
System used
Number of 90° elbows needed:
Number of 45° elbows needed:
Table 8
Calculation of example
Max. length
90° elbow reduction
sub-total =
45° elbow reduction
Table 9
For this example, the maximum allowable
i
exhaust pipe length is 12 feet.
Combustion air
System used
Number of 90° elbows needed:
Number of 45° elbows needed:
Table 10
Calculation of example
Max. length
90° elbow reduction
sub-total =
45° elbow reduction
Table 11
For this example, the maximum allowable
i
combustion air pipe length is 10 feet.
6 720 644 887
Concentric
1
2
23'
- 5'
18'
- 6'
Total = 12'
Concentric
2
1
23'
- 10'
13'
- 3'
Total = 10'
Calculation example for 4" venting:
Exhaust
System used
Number of 90° elbows needed:
Number of 45° elbows needed:
Table 12
Calculation of example
Max. length
90° elbow reduction
sub-total =
45° elbow reduction
Table 13
For this example, the maximum allowable
i
exhaust pipe length is 58.5 feet.
Combustion air
System used
Number of 90° elbows needed:
Number of 45° elbows needed:
Table 14
Calculation of example
Max. length
90° elbow reduction
sub-total =
45° elbow reduction
Table 15
For this example, the maximum allowable
i
combustion air pipe length is 55 feet.
Installation instructions
Twin pipe
1
2
63'
- 2.5'
61.5'
- 3'
Total = 58.5'
Twin pipe
2
2
63'
- 5'
58'
- 3'
Total = 55'
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