11
TECHNICAL PASSPORT INSTALLATION and OPERATION MANUAL
Point where flue passes through
weather surface (Note 1,2)
Clearance to flue outlet
A
At or within 600mm of the ridge
At least 600mm above the ridge
B
Elsewhere on a roof (whether pitched or
flat)
At least 2300mm horizontally from
the nearest point on the weather
surface and;
a; at least 1000mm above the
highest point of intersection of the
chimney and the weather surface; or
b; at least as high as the ridge
C
Below (on a pitched roof) or within
2300mm horizontally to an openable
rooflight, dormer window or other
opening (Note 3)
At least 1000mm above the top of
the opening
D
Within 2300mm of an adjoining building,
whether or not beyond the boundary
(Note 3)
At least 600mm above the adjacent
building
Notes
1) The weather surface is the building external surface, such as its roof, tiles or
external walls.
2) A flat roof has a pitch less than 10
o
.
3) The clearance given for A or B, as appropriate, will also apply.