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18
7.0 Site Requirements
7.12
Flue Options
1. The Potterton Performa System 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:-
12e,18e,24e 28e
Concentric
5m
4m
Vertical
4m
4m
Vertical Two-Pipe
15m
12m
4. Any additional “in line” bends in the flue system
must be taken into consideration.
Their equivalent lengths are:-
Concentric Pipes:
45° bend
0.5 metres
90° bend
1.0 metres
Twin Flue Pipe
45° bend
0.25 metres
90° bend
0.50 metres
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.
Horizontal
Flues
Vertical
Flues
Vertical
Flues
(Twin Pipe)
Maximum Length = 3m (28e) 4m (12e,18e,24e)
inc. 2 x 45° bends
Maximum Length =
11m (28e)
14m (12e,18e,24e)
inc. 4 x 45° bends
Maximum Length = 2m
inc. 2 x 90° bends
Summary of Contents for Performa System 12e
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