Potterton Performa 24i HE Installation And Service Instructions Manual page 19

7.0 SITE REQUIREMENTS
7.11 Flue Options
1. The Potterton Performa 24i HE can be fitted with
flue systems as illustrated.
2. The standard flue is suitable only for horizontal
applications.
3. Maximum permissible equivalent flue lengths are:-
Horizontal Concentric
Vertical Concentric
Vertical Twin Pipe
4. Any additional "in line" bends in the flue system
must be taken into consideration. Their equivalent
lengths are:-
Concentric Pipes:
45° bend
93° bend
Twin Flue Pipe
45° bend
91.5° bend
The elbow supplied with the standard horizontal flue
is not included in any equivalent length calculations
5. The illustrations opposite show examples of
maximum equivalent lengths.
6. Instructions for guidance and fitting are included in
each kit where appropriate.
NOTE: Flue length is measured from point A to B
as shown.
Vertical
Flues
B
A
Publication No. 5111813
4m
4m
12m
0.5 metres
1.0 metres
0.25 metres
0.50 metres
Horizontal
Flues
Vertical
Flues
(Twin Pipe)
B
A
B
A
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