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SYSTEM DESIGN AND PLANNING INFOrMATION
4.0
4.5 FLuE LOcATION AND vENTILATION
a)
Flue Position and Length
The flue installation procedures, location of flue terminals, flue kit options etc are described in detail in the 'Gledhill High Efficiency
Condensing Combination Boiler Flue design & Installation Manual' which is also supplied with the boiler and should be read along
with these instructions prior to installation.
The standard flue is fitted on the top of the boiler as shown in figure 4.1a. The minimum dimensions 'L' required for rear, LH side and RH
side are different and must be measured and compared against the standard flue supplied with the boiler to check if it is suitable. The
minimum dimension 'X' corresponding to the minimum clearances and wall thickness 'W' (see figures 4.1a – 4.1d) can be calculated
as follows: -
Rear outlet:
L1 (mm) = W + 66 + 45 = W + 111,
RH side outlet:
L (mm) = W + 110 + 0 + 45 = W + 175,
LH side outlet:
L3 (mm) = W + + 0 + 45 = W + 87,
An extended flue system can be installed with the addition of extension kits [see section 4.5 (b) ]. The flue system must always be
designed and installed to have a continuous fall towards the boiler of at least 1½º (i.e. 18mm per metre run).
The flue can be installed from inside the building when access to the outside wall face is not practical.
Wall Thickness
W
X1 = 66
L1
L1
L1
A
A
A
Figure 4.12a
Horizontal Balanced Flue - rear Outlet
70
Figure 4.12d
Standard Horizontal Balanced Flue Terminal
Note: the terminal can be installed level as the internal flue already incorporates the necessary fall (as shown)
H
95
A
G
G
G
G
X3 =
L
X
L
X = 110
140
180
Figure 4.12b Horizontal Balanced Flue - rH Outlet
Figure 4.12c Horizontal Balanced Flue - LH Outlet
180
140
L3
Page
W
Wall Thickness
0mm minimum
0mm minimum
W
Wall Thickness
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