Specifications

Installation instructions | 13
6 720 644 936 (2013/01)830 ES
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 11
Calculation of example
Max. length 28,5’
90° elbow reduction - 2,5’
sub-total = 26’
45° elbow reduction - 2,5’
Total = 23,5’
Table 12
For this example, the maximum allowable exhaust pipe
length is 23,5 feet.
System used Concentric
Number of 90° elbows needed: 2
Number of 45° elbows needed: 1
Table 13
Calculation of example
Max. length 28,5’
90° elbow reduction - 5’
sub-total = 23,5’
45° elbow reduction - 1,25’
Total = 22,25’
Table 14
For this example, the maximum allowable combustion
air pipe length is 22,25 feet.
System used Twin pipe
Number of 90° elbows needed: 2
Number of 45° elbows needed: 2
Table 15
Calculation of example
Max. length 61,25’
90° elbow reduction - 2,5’
sub-total = 58,75’
45° elbow reduction - 1,5’
Total = 57,25’
Table 16
For this example, the maximum allowable exhaust pipe
length is 57,25 feet.
System used Twin pipe
Number of 90° elbows needed: 1
Number of 45° elbows needed: 2
Table 17
Calculation of example
Max. length 61,25’
90° elbow reduction - 1,25’
sub-total = 60’
45° elbow reduction - 1,5’
Total = 58,5’
Table 18
For this example, the maximum allowable combustion
air pipe length is 58,5 feet.