Potterton Promax System HE Installation And Servicing Instructions page 16

Standard Flue
B
J
M
H
E
H
16
A
K
L
C
N
G
7.0 Site Requirement
C
7.13
Concentric
The maximum equivalent lengths are 4m
(horizontal) or (vertical). There lengths exclude the
standard elbow and flue/terminal assembly
(horizontal) and terminal assembly (vertical).
Twin Flue
The total maximum equivalent flue length is 150m.
NOTE: Each 1m of flue duct should be calculated
D
as 2m.
Any additional "in line" bends in the flue system
must be taken into consideration. Their equivalent
lengths are:
Concentric Pipes: 45° bend
Twin Flue Pipe:
Detailed examples of equivalent flue length
calculation are given in the Installation Guidance
Notes for each flue system type.
(Documents 243501 and 243502 for concentric and
twin pipe respectively).
Key Accessory
Concentric Flue System 110mm diameter
A
B
C
D
Twin Flue System 80mm diameter
E
F
G
Universal Vertical Flue Kits
F
H
J
K
L
M
N
Flue options
93° bend
45° bend (air duct)
45° bend (flue duct)
90° bend (air duct)
90° bend (flue duct)
Size
Straight extension kit 1000mm
500mm
250mm
Bend kit 93°
Bend kit (pair) 45°
Horizontal flue terminal
Clamp 110mm
Straight extension kit 1000mm
500mm
250mm
Bend kit 90°
Bend kit (pair) 45°
Twin flue adaptor kit
Vertical flue terminal
Universal roof tile 25°/50°
Roof cover plate kit
Flat roof flashing
Boiler connection vertical concentric
Clamp 80mm
0.5 m
1.0 m
1.3 m
2.6 m
4.8 m
9.6 m
Baxi Code
Number
241695
241694
241692
241687
241689
243013BAX
243014BAX
238690
238692
238694
246139
246138
242757
242802
243015
243131
243016BAX
242886
238684