2-3-8 Installing flue (Flue Options - Horizontal Flue Systems)
Twin & Vertical Flue Systems
1. Maximum permissible equivalent flue lengths are:-
2. Any additional " in lin" bends in the flue system must be taken into consideration
Their equivalent lengths are:-
Concentric Pipes:
Twin Flue Pipe
130 bend
0.5 metres
135 bend
0.25 metres
93 bend
1.0 metres
91.5 bend
0.50 metres
The elbow supplied with the standard horizintal telescopic flue kit is not included any equivalent length
calculations
Vertical Concentric
15 metres
Vertical Twin Pipe
20 metres
10 metres
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