Bosch 940 ES - Page 19

Installation instructions
19
940 ES – 6 720 644 930 (2019/09)
For this example, the maximum allowable combustion air pipe
length is 22,25 feet.
Calculation example for 4" venting:
Exhaust
Table 15
Table 16
For this example, the maximum allowable exhaust pipe length is
57,25 feet.
Combustion air
Table 17
Table 18
For this example, the maximum allowable combustion air pipe
length is 58,5 feet.
System used Twin pipe
Number of 90° elbows needed: 2
Number of 45° elbows needed: 2
Calculation of example
Max. length 61,25’
90° elbow reduction - 2,5’
sub-total = 58,75’
45° elbow reduction - 1,5’
Total = 57,25’
System used Twin pipe
Number of 90° elbows needed: 1
Number of 45° elbows needed: 2
Calculation of example
Max. length 61,25’
90° elbow reduction - 1,25’
sub-total = 60’
45° elbow reduction - 1,5’
Total = 58,5’