© MHG Heating Ltd
21
MHG Heating Ltd Unit 4 Epsom Dow ns Metro Centre, Waterfield, Tadw orth, Surrey KT20 5LR
Telephone 01737 358000 Fax 08456 448803 Email
Web w w w .mhgheating.co.uk
010717
7.1 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 dw elling
1200*
Not Recommended**
Not Recommended**
K
Vertically from a terminal on the same w all
#
1500
2500
2500
#
L
Horizontally from a terminal on the same w all
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 Lev el
300
4.5675 x (kW) -19.723
4.5675 x (kW) -19.723
P+
Above a flat roof (Obstacle<2500)
From Obs tac le Lev el
300
4.5675 x (kW) -19.723
4.5675 x (kW) -19.723
Q
From an adjacent w all (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 w ith the Clean Air Act w ith 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 w here it may cause injury to persons
resulting from touching a hot surface.
Absolute guidance must be sought f rom the respectiv e regulation.
