INS
TALLER
US
ER
MAINTEN
AN
CE TECHNI
CI
AN
17
TYPE OF DUCT
Resistance
Factor
(R)
Length
in metres of
concentric pipe Ø
60/100
Length
in metres
of a Ø 80 pipe
Length
in metres
of a Ø 60 pipe
Length
in metres 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
Ø 60/100 90° concentric
bend
Intake and
Exhaust 8.2
m 1.3
Intake m 9.4
Exhaust m 2.5
m 3.9
Exhaust m 6.8
Ø 60/100 45° concentric
bend
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 con-
centric horizontal intake-ex-
haust 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
Intake terminal -
horizontal concentric exhaust
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
Complete intake terminal -
vertical concentric 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 terminal
intake 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
Ø 80 90° bend
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
Ø 80 45° 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 m 3.8
Exhaust m 1.0
m 1.5
Exhaust m 2.7
Ø 60 90° bend
for ducting
Exhaust 3.5
m 0.55
Intake m 4.0
Exhaust m 1.1
m 1.6
Exhaust m 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 ver-
tical exhaust Ø 60 for ducting
Exhaust 12.2
m 1.9
Intake m 14
Exhaust m 3.7
m 5.8
Exhaust m 10.1
