Fig.21b
Fig.21c&Fig.21d
page29
8.12DeterminingPermissibleLengths
Inthegraphthesolidlinediagonalrepresentstherelationshipbetweentheconcentricflueassembly(andanyextensions)andthe60Øexhaust(andanyextensions
oradditionalbends).
Example1NotPermissible
If,forinstance,aconcentriclengthof4metreswasrequiredandthe60Øexhaustneededtobe3metresthegraphshowsthatthiscombinationwouldNOTbepermissibleasthe
intersectionpointwouldbeabovethesoliddiagonalline.
Example2FlueLengthsOK