9
INS
TALLER
US
ER
MAINTEN
AN
CE TECHNI
CI
AN
1.8 TABLES OF RESISTANCE FACTORS
AND EQUIVALENT LENGTHS.
TYPE OF DUCT
Length
in m of concentric pipe
Ø 60/100
Length
in metres
of pipe
Ø 80
Concentric pipe Ø 60/100 m 1
m 1
Intake m 7.1
Exhaust m 5.5
Terminal complete with intake-exhaust
horizontal concentric Ø 60/100
m 2.8
Intake m 20
Exhaust m 15
Intake-exhaust terminal
horizontal concentric Ø 60/100
m 1.9
Intake m 14
Exhaust m 10.6
Intake-exhaust terminal
vertical concentric Ø 60/100
m 2.5
Intake m 18
Exhaust 14
Pipe Ø 80 m 1 (with and without insulation)
m 0.1
Intake m 1.0
m 0.2
Exhaust m 1.0
Complete intake terminal Ø 80 m 1
(with or without insulation)
m 0.3
Intake m 2.2
Intake terminal Ø 80
Exhaust terminal Ø 80
m 0.2
Intake m 1.3
m 0.1
Exhaust m 0.8
Split parallel Ø 80
from Ø 60/100 to Ø 80/80
m 0.5
Intake m 3.8
Exhaust m 2.9