Bradford White RTG 199 MEN Installation And Operation Instructions Manual page 14

Installation instructions
Calculation example for 3" venting:
Exhaust
System used
Number of 90° elbows needed:
Number of 45° elbows needed:
Table 11
Calculation of example
Max. length
90° elbow reduction
sub-total =
45° elbow reduction
Total =
Table 12
For this example, the maximum allowable exhaust pipe
length is 18.5 feet.
Combustion air
System used
Number of 90° elbows needed:
Number of 45° elbows needed:
Table 13
Calculation of example
Max. length
90° elbow reduction
sub-total =
45° elbow reduction
Total =
Table 14
For this example, the maximum allowable combustion
air pipe length is 16 feet.
14
Calculation example for 4" venting:
Exhaust
Concentric System used
1 Number of 90° elbows needed:
2 Number of 45° elbows needed:
Table 15
Calculation of example
28.5' Max. length
- 5' 90° elbow reduction
23.5' sub-total =
- 5' 45° elbow reduction
18.5' Total =
Table 16
Combustion air
Concentric System used
2 Number of 90° elbows needed:
1 Number of 45° elbows needed:
Table 17
Calculation of example
28.5' Max. length
- 10' 90° elbow reduction
18.5' sub-total =
- 2.5' 45° elbow reduction
16' Total =
Table 18
For this example, the maximum allowable exhaust pipe
length is 46.25 feet.
For this example, the maximum allowable combustion
air pipe length is 51.25 feet.
RTG 199 ME – 6 720 811 615 (2015/04)
Twin pipe
2
2
61.25'
- 10'
51.25'
- 5'
46.25'
Twin pipe
1
2
61.25'
- 5'
56.25'
- 5'
51.25'