16 < < < <
11 Calculation of flue system
The possibilities for the lengths of flue pipes and the possible restrictors have been recorded
in a table (see chapter 12 ) This table works with a vertical and a horizontal length.
To define the vertical length all lengths of flue pipes in a vertical direction should
be added up.
- The roof terminal always counts as 1 metre.
To define the horizontal length all lengths of flue pipes in a horizontal direction
should be added up.
- every 90° bend in the horizontal part counts as 2 metres.
- every 45° bend in the horizontal part counts as 1 metre.
- Turns from vertical to horizontal or vice versa are not reckoned in the
calculation.
- The wall terminal always counts as 1 metre.
If there is transit under 45° then the real vertical and horizontal lengths should be
calculated.
11.1 Points of particular interest:
The maximum chimney length is 12 metres.
You can never start with a 90° or 45° bend from the appliance.
You should always start with 1 metre vertical if the horizontal transit is more than 1
metre.
You should never start with a cut-down pipe from the appliance.
To Next Page
Loading...
