12
www.johnsonandstarleyltd.co.uk
If an extended horizontal flue is being used (any flue
length longer than the standard kit) it must have a con-
tinuous fall back towards the appliance of 2.5°. This
ensures that condensate runs back into the appliance
from the flue system.Reference should be made to table
3.5 for relevant part numbers.
The maximum length of flue permissible is calculated
using the component pressure drop and examples are
given on page15 which include the maximum lengths at
95% of input.
The minimum 60/100 concentric horizontal flue length
measured from the centre line of the turret to the outside
of the wall is 247mm.
The minimum vertical flue length is 1.14 m measured
from the top of the appliance case to the top of the termi-
nal.
The minimum combined 80 twin flue length is 600mm.
Longer flues may be fitted, however the input of the
appliance will be reduced accordingly.
Elbows may be fitted within the flue system with a corre-
sponding reduction in overall flue length based on the
component pressure drop.Reference should be made to
tables 3-3 to 3-5 on page 15.
Fig.3-5
Overall Assembled Flue Length = Measured Distance
+ 632mm
111
Roof Line
632
Use this measurement to calculate the overall flue length
Overall Assembled Flue Length
Adaptor
