Worcester Highflow 400 RSF Installation And Servicing Instructions page 29

Fig. 29. Flue Option 8. Extension flue upwards and horizontal using a second and third 90° flue bend.
The three lengths, when added
together, must not exceed 1000mm
Air duct = (B - 166) mm
Flue duct = (B - 152) mm
210mm
minimum
Fig. 30. Flue Option 9. Horizontal section of flue duct before the first 90° flue bend.
Total length of straight flue
including this section must not
exceed the length stated in the
flue option chosen.
Appliance
Second 90¡
flue bend
Air duct = (B - 166) mm
Flue duct = (B - 152) mm
B
Appliance
For Flue Options 2, 4, 5, 6, 7 and 8.
Air duct = (D - 82) mm
Flue duct = (D - 80) mm
A flue adaptor must be fitted
before the horizontal section
of flue duct.
Third 90¡
flue bend
First 90¡
flue bend
First 90¡
flue bend
D 105mm minimum
Appliance Side View
29
Outside wall
Air duct = (C - 58) mm
Flue duct = (C - 14) mm
Horizontal section of
flue duct before the
first 90¡ flue bend