© MHG Heating Ltd
24
MHG Heating Ltd Unit 4 Epsom Downs Metro Centre, Waterfield, Tadworth, Surrey KT20 5LR
Telephone 08456 448802 Fax 08456 448803 Email
Web www.mhgheating.co.uk
140116
9.8 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
IGE-UP-10
Boilers Input
>70kW <333kW
Net
Nat Draught
Balanced Flue
W
A
Directly below an opening into the building
300
2500
2500
2500
B
Below gutter soil pipes etc.
75
200
200
300
C
Below Eaves
200
200
200
300
D
Below balconies or car port roof
200*
Not Recommended**
Not Recommended**
Not Recommended**
E
From vertical drain or soil pipe etc.
150
150
150
150
F
From internal or external corners
300
If <2500 use Plume Ext
If <2500 use P/T below
#
Not Recommended**
G
Above ground or balcony level
300
If <3000 use Plume Ext
If <3000 use Plume Ext
Not Recommended**
H
From a surface facing the terminal
600
23.126 x (kW) + 618.84
23.126 x (kW) + 618.84
Not Recommended**
I
From a terminal facing the terminal
#
1200
19.32 x (kW) + 647.59
19.32 x (kW) + 647.59
#
Not Recommended**
J
From opening in a carport into a dwelling
1200*
Not Recommended**
Not Recommended**
Not Recommended**
K
Vertically from a terminal on the same wall
#
1500
2500
2500
#
2500
L
Horizontally from a terminal on the same wall
300
7.232 x (kW) + 93.708
9.5156 x (kW) + 833.91
1.9031 x (kW) + 1866.8
M
Above an opening into the building
300
7.232 x (kW) + 93.708
9.5156 x (kW) + 833.91
1.9031 x (kW) + 1866.8
N
Horizontally to an opening into the building
300*
7.232 x (kW) + 93.708
9.5156 x (kW) + 833.91
1.9031 x (kW) + 1866.8
P
Above a flat roof (Obstacle> 2500)
From Roof Level
300
4.5675 x (kW) -19.723
4.5675 x (kW) -19.723
3.4256 x (kW) + 360.21
P+
Above a flat roof (Obstacle<2500)
From Obstacle Level
300
4.5675 x (kW) -19.723
4.5675 x (kW) -19.723
3.4256 x (kW) + 360.21
Q
From an adjacent wall (edge of terminal)
300
If <2500 use Plume Ext
If <2500 use Plume Ext
#
Not Recommended**
R
To an opening into the building
1000
7.232 x (kW) + 93.708
9.5156 x (kW) + 833.91
1.9031 x (kW) + 1866.8
S
From any other flue terminal
#
300
7.232 x (kW) + 93.708
9.5156 x (kW) + 833.91
#
1.9031 x (kW) + 1866.8
T
Above a >20
0
Pitched Roof (BOT)
300
4.5675 x (kW) -19.723
4.5675 x (kW) -19.723
3.4256 x (kW) + 360.21
T+
Above a >20
0
Pitched Roof (BOT) (Valley)
300
4.5675 x (kW) -19.723
4.5675 x (kW) -19.723
3.4256 x (kW) + 360.21
kW=Net Heat Input. * Positions not recommended. ** Risk assessment required (App 9). (BOT = Base of Terminal). # Contact MHG.
Horizontal Terminals Shall Not Be Located: Discharging into any road, track, thoroughfare, walkway or property boundary, to any play area/playing field, seating area or area where
public gatherings take place. Where a surface or building element that may be adversely affected from plume condensates. Where vehicles may be parked unless separated by at
least 1800mm.
Areas that may affect the dispersion of products of combustion, foliage, shrubs, trees, canopies, roof structures, nearby structures, or any locations with unfavorable wind conditions.
Groups of appliances of (333kW net input) and above must comply with the Clean Air Act with respect to the chimney discharge height.
Where a chimney is used, the chimney height, rounded up to the nearest meter, shall give a termination position at least 3m above the level of any adjacent area to which there is
general access, for example ground level, roof areas or adjacent openable windows. The chimney height shall not be less than the height of any building within a distance of 5 x the
uncorrected chimney height (U) for appliances above 134kW net heat input. U = 1.496 [Qx1.1]
0.6
where Q = Net Heat Input MW
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
Document Intended for quick guidance only. Absolute guidance must be sought from the respective regulation
