© MHG Heating Ltd
20
MHG Heating Ltd Unit 4 Epsom Downs Metro Centre, Waterfield, Tadworth, Surrey KT20 5LR
Telephone 01737 358000 Fax 08456 448803 Email
Web www.mhgheating.co.uk
010517
8.1 Balanced Flue Terminal Positions For Boilers Below and Above 70kW Net Input
(All measurements are in mm and are minimum clearances)
Terminal Location
BS5440
Boilers with
a rated
Input
<70kW Net
IGE-UP-10
Boilers Input >70kW
<333kW Net
Fan Draught Balanced
Flue
X
IGE-UP-10
Boilers Input >70kW
<333kW Net
Fan Draught&
Open Flued
V
A
Directly below an opening into the building
300
2500
2500
B
Below gutter soil pipes etc.
75
200
200
C
Below Eaves
200
200
200
D
Below balconies or car port roof
200*
Not Recommended**
Not Recommended**
E
From vertical drain or soil pipe etc.
150
150
150
F
From internal or external corners
300
If <2500 use Plume Ext
If <2500 use P/T below
#
G
Above ground or balcony level
300
If <3000 use Plume Ext
If <3000 use Plume Ext
H
From a surface facing the terminal
600
23.126 x (kW) + 618.84
23.126 x (kW) + 618.84
I
From a terminal facing the terminal
#
1200
19.32 x (kW) + 647.59
19.32 x (kW) + 647.59
#
J
From opening in a carport into a dwelling
1200*
Not Recommended**
Not Recommended**
K
Vertically from a terminal on the same wall
#
1500
2500
2500
#
L
Horizontally from a terminal on the same
wall
300
7.232 x (kW) + 93.708
9.5156 x (kW) + 833.91
M
Above an opening into the building
300
7.232 x (kW) + 93.708
9.5156 x (kW) + 833.91
N
Horizontally to an opening into the building
300*
7.232 x (kW) + 93.708
9.5156 x (kW) + 833.91
P
Above a flat roof (Obstacle> 2500) From
Roof Level
300
4.5675 x (kW) -19.723
4.5675 x (kW) -19.723
P+
Above a flat roof (Obstacle<2500) From
Obstacle Level
300
4.5675 x (kW) -19.723
4.5675 x (kW) -19.723
Q
From an adjacent wall (edge of terminal)
300
If <2500 use Plume Ext
If <2500 use Plume Ext
#
R
To an opening into the building
1000
7.232 x (kW) + 93.708
9.5156 x (kW) + 833.91
S
From any other flue terminal
#
300
7.232 x (kW) + 93.708
9.5156 x (kW) + 833.91
#
T
Above a >20
0
Pitched Roof (BOT)
300
4.5675 x (kW) -19.723
4.5675 x (kW) -19.723
T+
Above a >20
0
Pitched Roof (BOT) (Valley)
300
4.5675 x (kW) -19.723
4.5675 x (kW) -19.723
kW=Net Heat Input. * Positions not recommended. ** Risk assessment required (App 9). (BOT = Base of Terminal). #
Contact MHG
Groups of appliances of 150kW gross input (136kW net input) and above must comply with the Clean Air Act with
respect to the chimney discharge height.
The terminal/s shall be guarded if it is less than 2000mm above the ground or in any position where it may cause injury
to persons resulting from touching a hot surface. Absolute guidance must be sought from the respective regulation.
