Bosch C1210ESC - Page 56

14 | Installation instructions
C 1210 ES/ESC6 720 644 887 (2013/02)
Calculation example for 4" venting:
Exhaust
Combustion air
System used Twin pipe
Number of 90° elbows needed: 1
Number of 45° elbows needed: 2
Table 15
Calculation of example
Max. length 63’
90° elbow reduction - 2.5’
sub-total = 61.5’
45° elbow reduction - 3’
Total = 58.5’
Table 16
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 17
Calculation of example
Max. length 63’
90° elbow reduction - 5’
sub-total = 58’
45° elbow reduction - 3’
Total = 55’
Table 18
For this example, the maximum allowable combustion
air pipe length is 55 feet.