Immergas HE COMBI INTERNAL Manual page 8

Tables of Resistance Factors and Equivalent Lengths.
TYPE OF DUCT
Concentric pipe Ø60/100 m 1
Concentric bend 90° Ø60/100
Concentric bend 45° Ø60/100
Terminal complete with concentric horizontal
intake-exhaust Ø60/100
Concentric horizontal
intake- exhaust terminal Ø60/100
Terminal complete with concentric vertical
intake-exhaust Ø60/100
Concentric vertical intake-exhaust terminal Ø60/100
Equivalent length in m
of Ø60/100
Resistance
concentric pipe
Factor
(R)
Intake and
Exhaust 16.5
Intake and
Exhaust 21
Intake and
Exhaust 16.5
Intake and
Exhaust 46
Intake and
Exhaust 32
Intake and
Exhaust 41.7
Intake and
Exhaust 26.5
8
in m of Ø80/125 pipe
Intake m
m 1
Exhaust m
Intake m
m 1.3
Exhaust m
Intake m
m 1
Exhaust m
Intake m
m 2.8
Exhaust m
Intake m
m 1.9
Exhaust m
Intake m
m 2.5
Exhaust m
Intake m
m 1.6
Exhaust m
Equivalent
length