12
INS
TALLER
US
ER
MAINTEN
AN
CE TECHNI
CI
AN
TYPE OF DUCT
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
60 Ø
Equivalent length
in m of concentric
pipe Ø 80/125
Concentric pipe Ø 60/100
m 1
Intake and
Exhaust 6.4
m 1
Intake m 7.3
Exhaust m 1.9
m 3.0
Exhaust m 5.3
Concentric bend 90° Ø
60/100
Intake and
Exhaust 8.2
1.3 m
Intake m 9.4
Exhaust m 2.5
m 3.9
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
m 3.0
Exhaust m 5.3
Terminal complete with
concentric horizontal
intake-exhaust Ø 60/100
Intake and
Exhaust 15
m 2.3
Intake m 17.2
Exhaust m 4.5
m 7.1
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
4.7 m
Exhaust m 8.3
Terminal complete with
concentric vertical in-
take-exhaust Ø 60/100
Intake and
Exhaust 16.3
m 2.5
Intake m 18.7
Exhaust m 4.9
m 7.7
Exhaust m 13.6
Concentric vertical
intake-exhaust terminal Ø
60/100
Intake and
Exhaust 9
1.4 m
Intake m 10.3
Exhaust m 2.7
m 4.3
Exhaust m 7.5
Pipe Ø 80 m 1
Intake 0.87
m 0.1
Intake m 1.0
Exhaust m 0.4
m 0.4
m 0.5
Exhaust 1.2
m 0.2
Exhaust m 1.0
Complete intake terminal
Ø 80 m 1
Intake 3
m 0.5
Intake m 3.4
Exhaust m 0.9
1.4 m
Intake terminal Ø 80
Exhaust terminal Ø 80
Intake 2.2
m 0.35
Intake m 2.5
Exhaust m 0.6
m 1
m 0.9
Exhaust 1.9
m 0.3
Exhaust m 1.6
Bend 90° 80 Ø
Intake 1.9
m 0.3
Intake m 2.2
Exhaust m 0.8
m 0.9
m 1.2
Exhaust 2.6
m 0.4
Exhaust m 2.1
45° 80 Ø Bend
Intake 1.2
m 0.2
Intake m 1.4
Exhaust m 0.5
m 0.5
0.7
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
m 1.5
Exhaust 2.7
Bend 90° Ø 60 for ducting
Exhaust 3.5
m 0.55
Intake 4.0
Exhaust m 1.1
1.6 m
Exhaust 2.9
Reduction Ø 80/60
Intake and
Exhaust 2.6
m 0.4
Intake m 3.0
Exhaust m 0.8
m 1.2
Exhaust m 2.1
Terminal complete with
exhaust
vertical Ø 60 for ducting
Exhaust 12.2
1.9 m
Intake m 14
Exhaust m 3.7
m 5.8
Exhaust m 10.1
