7.0 Site Requirements
15
7.10
Flue Dimensions
See Section 1.2. The standard horizontal flue kit
allows for flue lengths between 270mm (10
5
/
8
”)
and 800mm (32”) from elbow to terminal
(Fig. 18).
The maximum permissible equivalent flue
length is: 4 metres
(Fig. 18a).
NOTE:
Each additional 45° of flue bend will
account for an equivalent flue length of 0.5m.
eg. 45° = 0.5m, 90° = 2 x 45° = 1m etc.
7.11
Terminal Guard
(Fig. 19)
1. When codes of practice dictate the use of
terminal guards, they can be obtained from most
Plumbers’ and Builders’ Merchants.
2. There must be a clearance of at least 50mm
between any part of the terminal and the guard.
3. When ordering a terminal guard, quote the
appliance model number.
4. The flue terminal guard should be positioned
centrally over the terminal and fixed as
illustrated.
7.12
Vertical Flue
1. Only a flue approved with the Potterton
Promax System HE can be used.
Fig. 18
Fig. 18a
Pictorial examples of flue runs where EQUIVALENT flue length equals 4m
Fig. 19
270mm
800mm
0.5m
1m
0.5m
0.5m
