Resistance Factors and Equivalent Lengths.
DUCT TYPE
Complete intake terminal Ø 80 m 1
Intake terminal Ø 80
Exhaust terminal Ø 80
90°bend Ø 80
45° bend Ø 80
Pipe 1 m Ø 60 for ducting
90° bend Ø 60 for ducting
Adapter Ø 80/60
Terminal complete with vertical
exhaust flue Ø 60 for ducting
Equivalent length
in m of
Resistance
concentric pipe
factor
Ø 60/100
(R)
Intake
0.5 m
3
Intake
0.35 m
2.2
Exhaust
0.3 m
1.9
Intake
0.3 m
1.9
Exhaust
0.4 m
2.6
Intake
0.2 m
1.2
Exhaust
0.25 m
1.6
Exhaust
0.5 m
3.3
Exhaust
0.55 m
3.5
Intake
and
0.4 m
exhaust
2.6
Exhaust
1.9 m
12.2
Equivalent length
Equivalent length
in metres
in metres
of pipe
of pipe
Ø 60
Ø 80
Intake
Exhaust
3.4 m
0.9 m
Intake
2.5 m
Exhaust
0.6 m
Exhaust
1.6 m
Intake
2.2 m
Exhaust
0.8 m
Exhaust
2.1 m
Intake
1.4 m
Exhaust
0.5 m
Exhaust
1.3 m
Intake
3.8 m
Exhaust
1.0 m
Exhaust
2.7 m
Intake
4.0 m
Exhaust
1.1 m
Exhaust
2.9 m
Intake
3.0 m
Exhaust
0.8 m
Exhaust
2.1 m
Intake
14 m
Exhaust
3.7 m
Exhaust
10.1 m
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