All flue systems must be securely supported at least once every metre.
Suitable pipe supports are available as accessories.
Vertical Flues (Twin Pipe)
Vertical Flues
Total Equivalent Length =
A+B+C+1x90°Bend
All vertical and angled runs must be included, measured from the boiler adaptor
(point X) to the joint with the flue terminal (point Y).
One 91.5° bend or two 135° bends can be included without reduction of the flue length.
If further elbows are required the flue length must be reduced by the following amounts:
1 metre for each 91.5° bend
0.5 metre for each 45° bend