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17
INS
TALLER
US
ER
MAINTEN
AN
CE TECHNI
CI
AN
TYPE OF DUCT
Resistance
Factor
(R)
Equivalent
length in metres of
concentric pipe Ø
80/125
Concentric pipe 80/125 Ø m 1
2.1
1
90° concentric bend 80/125 Ø
3.0
1.4
Concentric bend 45° Ø 80/125
2.1
1
Terminal complete with concentric horizontal intake-exhaust
Ø 80/125
2.8
1.3
Terminal complete with concentric vertical intake-exhaust
Ø 80/125
3.6
1.7
90° concentric bend Ø 80/125 with inspection
3.4
1.6
Stub pipe with inspection Ø 80/125
3.4
1.6
1.12 TABLES OF RESISTANCE FACTORS AND EQUIVALENT LENGTHS OF “GREEN RANGE” FLUE SYSTEM
COMPONENTS.