Potterton Performa 28i Installation And Servicing Instructions page 18

Maximum Length = 3m inc. 2 x 45° bends
Vertical
Flues
(Twin Pipe)
Maximum Length = 11m
inc. 4 x 45° bends
Vertical
Flues
Maximum Length = 2m
inc. 2 x 90° bends
18
Horizontal
Flues
7.0 Site Requirements
7.12 Flue Options
1. The Potterton Performa 28i can be fitted with
flue systems as illustrated.
2. The standard flue Kit No 247719 is suitable
only for horizontal applications.
3. Maximum permissible equivalent flue lengths
are:-
Concentric
Vertical
Vertical Two-Pipe
4. Any additional "in line" bends in the flue system
must be taken into consideration. Their equivalent
lengths are:-
Concentric Pipes:
45° bend
90° bend
Twin Flue Pipe
45° bend
90° 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.
4m
4m
12m
0.5 metres
1.0 metres
0.25 metres
0.50 metres