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Appendix 5: Calculation sheet for checking
projected route
Follow the three steps below to check whether the desired route for the concentric chimney exhaust is permitted.
1. Sketch the desired route and use it as a basis for filling in the information required in the table below. You can
disregard the actual roof or wall sleeve here.
Description
Number of metres, vertical
Number of metres horizontally 100mm/150mm
Number of metres horizontally 130mm/200mm... x 0.5 metres
Number of metres at an angle of 45°
Number of elbows up to 45°: ... x 0.5 metres per elbow
Number of elbows up to 90°: ... x 1.0 metres per elbow
2. Use the data above to calculate the values in the following table:
Description
Total resistance length = (1)+(2)+(3)+(4)+(5)+(6)
Total vertical length = (1)
Total horizontal length = (2)+(3)+(5)+(6)
Total vertical length minus Total horizontal length = V - H
3. Use the table below to determine whether the desired route is permitted and what the position of the restric-
tion plate should be for the appliance to function optimally.
Subject to change because of technical improvements
Measured
Abbreviation
value
(1)
... metre
(2)
... metre
(3)
... metre
(4)
... metre
(5)
... metre
(6)
... metre
Abbreviation Result
L
... metre
V
... metre
H
... metre
R
... metre
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