6m
2m
Bracket at
each 1 metre
1m
4m
1.5m
6m
1.5º back
to boiler
1.5º back
to boiler
Air
Elbows 2 x 1m = 2m
Straights 6+2+0.15 = 8.15m
Total = 10.15m
Overall Flue / Air = 25.65m
Flue
Elbows 3 x 1m = 3m
Straights 4+6+1.5+1 = 12.5m
Total = 15.5m
Calculations
0.15m
Sleeve
2m
2.5m
1.5m
2m
4m
4m
0.15m
3.5m
3.5m
1.5º back
to boiler
Air
Sleeve
1.5º back
to boiler
Bracket every
1 metre
Flue
3 x 90º elbows
3
Straight lengths
2.5
1.5
3.5
4
14.5
Overall Flue / Air = 30.15m
Air
4 x 90º elbows
4
Straight lengths
2
2
3.5
4
0.15
15.65
Calculations
2
4
6
8
10 12
14 16
18 20
22 24
26
28
2
6
10
14
18
22
26
30
Acceptable Operating Area
Keston Combi 35 - Flue & Air Pipe Length
Flue Pipe Length [m]
A
ir P
ipe
L
engt
h [m
]
15.65
14.5
2
4
6
8
10 12 14 16 18 20 22 24 26 28 30
2
6
10
14
18
22
26
30
34
38
Acceptable Operating Area
Keston Combi 30 - Flue & Air Pipe Length
Flue Pipe Length [m]
A
ir P
ipe
L
engt
h [m
]
10.15
15.5
Keston Combi
2
C30 - Flue & Air Pipe Length
Keston Combi
2
C35 - Flue & Air Pipe Length
2.9 FLUE INSTALLATION EXAMPLE KESTON COMBI
2
C30
2.10 FLUE INSTALLATION EXAMPLE KESTON COMBI
2
C35
19
Installation and Servicing
FLUE OUTLET
Section 2 - Installation