17
7.0
SITE REQUIREMENTS
Publication No. 5106451
7.8
Flue Dimensions
See Section 2.2. 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.
7.9
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 name and model number.
4. The flue terminal guard should be positioned
centrally over the terminal and fixed as illustrated.
7.10
Vertical Flue
1. Only a flue approved with the Potterton Promax 15
HE & 24 HE can be used.
2. For information on vertical flues consult the
Potterton Flue Guide Brochure or Guidance Notes
supplied with the vertical flue pack.
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
