Page 12 of 33
2.5 BS5440 – Up to 70kW continued…
No part of the chimney outlet shall be less
than 1500mm measured horizontally to the
roof surface or 600mm above the ridge.
If the chimney penetrates the dotted area,
and distance A is less than 1500mm, then
distance B shall not be less than 600mm.
Examples of the structure referred to above
include a parapet, dormer window or
chimney stack.
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