Worcester Highflow 400 RSF Installation And Servicing Instructions page 9

Fig. 5. Flue options.
Standard flue length
100 to 500mm
Appliance
Frame 1: Flue Option 1. Standard Horizontal Rear Flue.
Maximum flue length
3000mm
Appliance
Frame 3: Flue Option 3. Extension Horizontal Rear Flue.
First 90¡ flue bend
Appliance
Frame 5: Flue Option 5. Extension Horizontal Flue using a
second 90° Flue Bend.
First 90¡
flue bend
Second 90¡
flue bend
Appliance
Total straight flue length
1000mm maximum
Frame 7: Flue Option 7. Extension Horizontal Flue using a
second and third 90° Flue Bend.
First 90¡
flue bend
Straight length must be
Appliance
included when working
out the total straight
flue length
Frame 9: Flue Option 9. To fit a horizontal section of flue duct
before the first 90° Flue Bend for Flue Options
2, 4, 5, 6, 7 and 8.
Second 90¡
flue bend
Total straight flue length
2300mm maximum
Third 90¡
flue bend
Straight
lengths
Appliance
side view
Note: A flue adaptor
must be fitted when a
horizontal section of
flue duct is required
before the first flue
bend.
90¡ flue bend
Appliance
Frame 2: Flue Option 2. Standard Horizontal Side Flue.
90¡ flue bend
Appliance
Frame 4: Flue Option 4. Extension Horizontal Side Flue.
Second 90¡
flue bend
Appliance
Frame 6: Flue Option 6. Extension upwards and
Horizontal Flue using a second 90° Flue Bend.
Second 90¡
flue bend
Straight
length
Appliance
Frame 8: Flue Option 8. Extension upward and Horizontal
Flue using a second and third 90° Flue Bend.
When deciding the flue length required, always
measure to the outside of the wall where the flue
terminal will be fixed.
When measuring between the centre lines of the
flue ducts, allow 83mm for each flue bend.
Frame 10
9
Standard flue length
100 to 950mm
Maximum flue length
3000mm
Straight
lengths
First 90¡ flue bend
Total straight flue length
2300mm maximum
Third 90¡
flue bend
Straight
First 90¡
lengths
flue bend
Total straight flue length
1000mm maximum
Flue
terminal
Outside
wall