HorizontalFlues
NOTE:Horizontalfluepipesshouldalwaysbeinstalledwithatleast1.5°fallfrom
theterminaltoallowcondensatetorunbacktotheboiler.
Totalequivalentlength=A+B+C+2x90°Bends
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8.2Twin&VerticalFlueSystems
1.Maximumpermissibleequivalentfluelengthsare:
VerticalConcentric(60/100) 5metres
VerticalTwinPipe(80/80) 10metres
2.Anyadditional"inline"bendsinthefluesystemmustbetakenintoconsideration.
Theirequivalentlengthsare:
ConcentricPipes:
135°bend 0.5metres
93°bend 1.0metres
TwinFluePipe
135°bend 0.25metres
91.5°bend 0.50metres
Theelbowsuppliedwiththestandardhorizontaltelescopicfluekitisnotincludedinanyequivalentlengthcalculations
NOTE:FluelengthismeasuredfrompointXtoYasshown.
IMPORTANT: