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Vertical
Flues
(ii)
(i)
IMPORTANT: All flue systems must be securely
supported at least once every metre. Suitable pipe
supports are available as accessories.
(ii)
(i)
Vertical
Flues
(Twin Pipe)
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 elbows 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
(i)
22
© Baxi Heating UK Ltd 2014
For terminal position
see literature
provided with kit
1m Min to
15m Max
Roof
Terminal
(ii)
C
B
This bend is equivalent to
1 metre
8.0 Flue Options
8.2
Twin & Vertical Flue Systems
1. Maximum permissible equivalent flue lengths are:-
Vertical Concentric
Vertical Twin Pipe
2. Any additional "in line" bends in the flue system must be
taken into consideration.
Their equivalent lengths are:-
Concentric Pipes:
Twin Flue Pipe
The elbow supplied with the standard horizontal telescopic
flue kit is not included in any equivalent length calculations
NOTE: Flue length is measured from point (i) to (ii) as
Y
shown.
Mini Terminal
600mm Min
apart
on Air Duct
(sited in loft)
T
1m Min
to
15m Max
The total equivalent length for this example is
1m extension
135°bend
91.5°bend
1m extension
135°bend
91.5°bend
(60/100)
(80/125)
10 metres
20 metres
15 metres
135° bend
0.5 metres
93° bend
1.0 metres
135° bend
0.25 metres
91.5° bend
0.50 metres
Q
= 6.5 metres.
AIR DUCT
Equivalent
N
o
of
Length Value
fittings/pipes
5
1m
0.25m
2
0.5m
2
Equivalent Length Air Duct = 6.5m
FLUE DUCT
Equivalent
N
o
of
Length Value
fittings/pipes
5
1m
0.25m
2
2
0.5m
Equivalent Length Flue Duct = 6.5m
Sub total
5.0m
0.5m
1.0m
Sub total
5.0m
0.5m
1.0m
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