Maximum permitted flue system length in metres of smooth
pipe. Standard flues only.
Type
Diameter Diameter Diameter Diameter Diameter Diameter
120 mm
R2700
25
R2701
16
R2702
**
R2703
**
R2704
**
R2705
**
R2706
**
R2707
**
R2708
**
R2709
**
R2800
28
R2801
17
R2802
**
R2803
**
R2804
**
R2805
**
R2806
**
R2807
**
R2808
**
R2809
**
R2900
32
R2901
17
R2902
**
R2903
**
R2904
**
R2905
**
R2906
**
R2907
**
R2908
**
R2909
**
Table 10 Length of flue system
The flue system lengths have been rounded down.
* Chimney diameter at the appliance
** Not applicable
2789CV02C
Length of flue system in m
150 mm
180 mm
200 mm
87*
-
56*
-
39*
-
**
62*
**
**
**
**
**
**
**
**
**
**
**
**
96*
-
59*
-
36
95*
**
61
**
30
**
**
**
**
**
**
**
**
**
**
110*
-
59*
-
36
95*
**
61
**
30
**
**
**
**
**
**
**
**
**
**
250 mm
300 mm
-
-
-
-
-
-
-
-
70*
-
35*
-
**
71*
**
50*
**
**
92*
**
**
69*
-
-
-
-
-
-
107*
-
54*
-
32
109*
21
76*
**
53
141*
**
38
105*
**
31
86*
-
-
-
-
-
-
107*
-
54*
-
32
109*
21
76*
**
53*
141
**
38
105*
**
31
86*
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
33
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