Tables of Resistance Factors and Equivalent Lengths.
DUCT TYPE
Resistance
Factor
(R)
Equivalent length
in m of concen-
tric pipe Ø 80/125
Equivalent leng-
th in metres of
pipe Ø 80
Concentric pipe Ø 80/125 m 1
Intake
and
exhaust
4,9
m 1,0
Exhaust
m 4,0
Concentric bend 90° Ø 80/125
Intake
and
exhaust
9,5
m 1,9
Exhaust
m 7,9
Concentric bend 45° Ø 80/125
Intake
and
exhaust
6,8
m 1,4
Exhaust
m 5,
6
Terminal complete with
concentric horizontal
intake-exhaust Ø 80/125
Intake
and
exhaust
26,8
m 5,5
Exhaust
m
22,3
Concentric horizontal intake-
exhaust terminal Ø 80/125
Intake
and
exhaust
22,9
m 4,7
Exhaust
m
19,0
Terminal complete with concentric
vertical intake-exhaust Ø 80/125
Intake
and
exhaust
16,7
m 3,4
Exhaust
m 13,
9
Terminal complete with concen-
tric vertical intake-exhaust Ø
80/125
Intake
and
exhaust
13,3
m 2,7
Exhaust
m
11,0
Pipe Ø 80, 1 m
Exhaust
1,2
m 0,24
Exhaust
m 1,0
Complete exhaust terminal Ø
80, 1 m
Exhaust
3,1
m 0,63
Exhaust
m 2,6
Exhaust terminal Ø 80
Exhaust
1,9
m 0,38
Exhaust
m 1,6
Bend 90° Ø 80
Exhaust
2,6
m 0,53
Exhaust
m 2,1
Bend 45° Ø 80
Exhaust
1,6
m 0,32
Exhaust
m 1,3
Terminal complete with
vertical exhaust Ø 80
Exhaust
3,6
m 0,73
Exhaust
m
3
119
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IE
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