110
IE
Tables of Resistance Factors and Equivalent Lengths.
DUCT TYPE
Resistance
Factor
(R)
Equivalent
length in m of concentric pipe
Ø 60/100
Equivalent
length in metres
of pipe Ø 80
Equivalent
length in metres
of pipe Ø 60
Concentric pipe Ø 60/100 m 1
Intake and
Exhaust 6.4
m 1
Intake m 7,3
Exhaust m1,9
Exhaust m 5,3
Concentric bend 90° Ø 60/100
Intake and
Exhaust 8,2
m 1,3
Intake m 9,4
Exhaust m 2,5
Exhaust m 6,8
Concentric bend 45° Ø 60/100
Intake and
Exhaust 6,4
m 1
Intake m 7,3
Exhaust m 1,9
Exhaust m 5,3
Terminal complete with concentric horizon-
tal intake-exhaust Ø 60/100
Intake and
Exhaust 15
m 2,3
Intake m 17,2
Exhaust m 4,5
Exhaust m 12,5
Concentric horizontal
intake- exhaust terminal Ø 60/100
Intake and
Exhaust 10
m 1,5
Intake m 11,5
Exhaust m 3,0
Exhaust m 8,3
Terminal complete with concentric vertical
intake-exhaust Ø 60/100
Intake and
Exhaust 16,3
m 2,5
Intake m 18,7
Exhaust m 4,9
Exhaust m 13,6
Concentric vertical intake-
exhaust terminal Ø 60/100
Intake and
Exhaust 9
m 1,4
Intake m 10,3
Exhaust m 2,7
Exhaust m 7,5
Pipe Ø 80, 1 m
Intake 0,87
m 0,1
Intake m 1,0
Exhaust m 0,4
Exhaust 1,2
m 0,2
Exhaust m 1,0
Complete intake terminal Ø 80, 1 m
Intake 3
m 0,5
Intake m 3,4
Exhaust m 0,9
Intake terminal Ø 80
Drain terminal Ø 80
Intake 2,2
m 0,35
Intake m 2,5
Exhaust m 0,6
Exhaust 1,9
m 0,3
Exhaust m 1,6
Bend 90° Ø 80
Intake 1,9
m 0,3
Intake m 2,2
Exhaust m 0,8
Exhaust 2,6
m 0,4
Exhaust m 2,1
Bend 45° Ø 80
Intake 1,2
m 0,2
Intake m 1,4
Exhaust m 0,5
Exhaust 1,6
m 0,25
Exhaust m 1,3
Pipe Ø 60 m 1 for ducting
Exhaust 3,3
m 0,5
Intake 3,8
Exhaust m 1,0
Exhaust 2,7
Bend 90° Ø 60 for ducting
Exhaust 3,5
m 0,55
Intake 4,0
Exhaust m 1,1
Exhaust 2,9
Reduction Ø 80/60
Intake and
Exhaust 2,6
m 0,4
Intake m 3,0
Exhaust m 0,8
Exhaust m 2,1
Terminal complete with exhaust
vertical Ø 60 for ducting
Exhaust 12,2
m 1,9
Intake m 14
Exhaust m 3,7
Exhaust m 10,1
