ROOM SEALED FLUE OPTIONS
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR DANESMOOR UTILITY 18/25
8 716 106 256C (03/2010)
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ROOM SEALED FLUE OPTIONS
The diagrams (opposite) show the components
used and the maximum flue length (L) for
each flue configuration.
In all cases L is measured from the outside of
the boiler casing.
• To achieve the maximum flue length (L), a flue
section will have to be reduced in length.
• Only the flue terminal or straight flue
extensions can be reduced in length by
cutting.
• The flue terminal end can be fitted from the
inside or outside of the building.
IMPORTANT: All horizontal sections must
rise away from the boiler by 52mm per
metre (3°) to allow the condensate to
drain back to the boiler.
A - Horizontal terminal
B - Straight flue extension
C - Flue bend 90°
D - Flue bend 45°
E - Vertical Terminal Kit (incl. 90° elbow)
Calculating the flue length:
Measure the total flue length required, noting
that the maximum straight flue length including
the terminal is:
Horizontal 80/125mmØ: 4000mm (excluding
120mm of terminal extending outside the building)
Vertical 80/125mmØ: 6000mm (measured from
the boiler top panel).
Then reduce the total straight flue length for
each extra flue bend (excluding the vertical flue
kit 90° elbow) by:
1000mm for 90°
500mm for 45°
Flue Extension lengths:
Horizontal & Vertical 80/125mmØ: 1000mm
overall length.
Effective length when engaged into sockets
within the flue run is 950mm.
Flue Terminal lengths:
Horizontal 80/125mmØ: 350-450/460-670 mm
Vertical 80/125mmØ: cage
* to outside wall.
D
L = 5000mm
125mmØ x5
L
L = 5000mm
125mm• x4
L
L = 6000mm
125mmØ x6
L
L
L = 2000mm
125mmØ x2
L = 140 - 390mm
L
L = 4000mm
125mmØ x4
L
L
L = 3000mm
125mmØ x3
L = 3000mm
125mmØ x3
L = 3000mm
L
125mmØ x3
L
x2
A
B
A
A
B
C
A
B
D
A
B
C
E
B
B
D
D
B
B
A
C
E
E
E
B
C
D
A
T
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