Trianco TRISTAR OPTIMA JUNIOR K CB, Installation Instructions Manual, Page: 29 / 44

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When determining the flue length on non-typical flue courses, it is important to take into consideration that each
additional elbow added to the run will dectract from the overall permitted flue length.
A 90° elbow should be classed as reducing the length of the overall run by 1500mm.
A 45° elbow should be classed as reducing the length of the overall run by 750mm.
Do not include the first 90° elbow on the boiler when calculating the maximum permitted length on the horizontal
flue; this has already been taken into consideration. See
figs 40 & 41 for example configurations.
6.17 ALTERNATIVE FLUEING EXAMPLES
Example 1 (horizontal) - Maximum permitted flue length: 4000mm
1 x additional 90° elbow: 1500mm
Maximum permitted length of A + B: 4000 minus 1500
= 2500mm
FIG. 40
FIG. 41
Example 2 (vertical) - Maximum permitted flue length: 6000mm
2 x additional 45° elbows: 750mm each (1500mm)
Maximum permitted length of D + E: 6000 minus 1500
=
4500mm