2
Twin Pipe Flue Systems
1
COMPONENTS AVAILABLE TO ORDER
Air duct
adaptor
Flue duct
adaptor
Clamp
Seal
Conversion Kit - 1000368
1000 mm Flue/Air Duct (80 mm) - 1000365
Vertical Terminal (80 mm) - 1000369
Ridge Tile Kit (80 mm) - 1000374
Horizontal Terminal (80 mm) - 1000370
90° Bend (80 mm) - 1000366
45° Bend (80 mm) - 1000367
1.
The flue system must be installed in accordance with BS 5440:1.
2.
The boiler must be installed in accordance with the Installation and Servicing instructions supplied with the boiler.
3.
The maximum equivalent flue lengths are as given below. (Refer to illustrations in section 3).
Alpha Boiler
Horizontal Flue
Vertical Flue (Inc. Terminal)
500E & 240 Range
10 m
7 m
280E
6 m
7 m
Note: i) Ensure the flue length does not exceed the equivalent shown in the table above.
ii) Alpha 500E - Remove the air restrictor when the flue length is more than 6 m.
4.
Each 90° Bend (80 mm) is equivalent to 0.50 m of flue length.
Each 45° Bend (80 mm) is equivalent to 0.25 m of flue length.
Note: A 90° bend must not be used with a vertical flue.
5.
Refer to the flue options shown to determine the equivalent length of flue pipe required. Ensure that this does not exceed
the maximum equivalent flue length given in the table above.
6.
The vertical flue terminal is equivalent to 1 m of flue length and must be positioned above the roof line as shown in Fig. 3.
7.
If a bend is to be fitted directly to the boiler, a clearance of 230 mm is required above the boiler.
8.
Refer to the Installation and Servicing instructions supplied with the boiler for details of permissible flue terminal positions
9.
For horixontal flues ensure there is a slight downward slope towards the terminal and there is no part of the flue system where
condensate will collect.
10. All parts of the exhaust flue duct must be at least 25 mm from any combustible material. When passing through a wall,
floor or roof, the flue duct must be separated from any combustible material or plastic by a non-combustible sleeve
providing a circular air space of at least 25 mm around the flue duct.
11. Any portion of the flue duct which could be touched must be encased or shielded to prevent access. This does not apply
to the air inlet duct.
2
INTRODUCTION
