Bosch C 950 ES - Page 13

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