Potterton Promax HE Store Installation & Servicing Instructions Manual page 15

600mm Min
apart
T
1m Min
to
15m Max
For terminal
position see
literature
provided with kit
Y
1m Min
to
15m Max
Y
The total equivalent length for this
example is = 6.5 metres.
Equivalent
Length Value
1m extension 1m
135°bend
0.25m
91.5°bend
0.5m
Equivalent Length Air Duct = 6.5m
Equivalent
Length Value
1m extension
1m
135°bend 0.25m
91.5°bend 0.5m
Equivalent Length Flue Duct = 6.5m
© Baxi Heating UK Ltd 2012
Mini Terminal
(sited in loft)
Z
Q
Z
AIR DUCT
N o of Sub total
fittings/pipes
5 5.0m
2 0.5m
2 1.0m
FLUE DUCT
N o of Sub total
fittings/pipes
5 5.0m
2 0.5m
2 1.0m
Vertical
Flues
(Twin Pipe)
Y
X
Vertical
Flues
Y
X
Total Equivalent Length =
A+B+C+1x90°Bend
All vertical and angled runs must be included,
measured from the boiler adaptor (point X) to
the joint with the flue terminal (point Y). One
91.5° bend or two 135° bends can be included
without reduction of the flue length.
If further bends are required the flue length
must be reduced by the following amounts:-
1 metre for each 91.5° bend
0.5 metre for each 135° bend
A
X
Roof
Terminal
Y
C
B
This bend is equivalent
to 1 metre
15