Installation & Servicing Instructions - Grant UK

9 Flue System and Air Supply
9.1 Low Level Discharge Flue
The Grant VORTEX Pro External module
is supplied with a low level discharge flue
(see Section 4).
The minimum dimensions for locating the
standard terminal from building features
(windows, doors, etc.) are shown in
Figure 9-1.
The terminal must be positioned so
as to avoid products of combustion
accumulating in stagnant pockets
around the buildings or entering into
buildings. Care should be taken that the
plume from the condensed flue gases
does not cause a nuisance.
Where it is not practical to use this flue,
the External module may be fitted with
an alternative flue system available from
Grant UK.
!
NOTE
Under no circumstances can the
External module be installed with an
existing flue system. Only Grant flue
systems and components suitable for
wet flues should be used.
Failure to install the correct type
of flue system will invalidate the
warranty.
9.2 Grant Green System
This vertical twin wall stainless steel
insulated flue system - constructed
using components from the Grant Green
system - connects to a Grant Starter
elbow and may terminate at high level or
vertically as required. See Figure 9-2.
The insulated Starter elbow includes
the boiler connector, complete with test
point, replacing the low level terminal
and flue guard supplied with the boiler.
Figure 9-1: Clearances for flue terminals
Terminal position
A Below a gutter or sanitary pipework
B Horizontal from an opening, air brick or window
C Above ground or balcony level
D Below eaves or balcony
E From an internal or external corner
F From a terminal facing the terminal
G From a surface facing the terminal
H Vertical from terminals on the same wall
I Horizontal from terminals on the same wall
J Below an opening, air brick, window etc.
K From vertical sanitary pipework
From an oil storage tank
Notes:
* 75 mm with protection.
** Only applies if one or both terminals are balanced flues.
Min. distance (mm)
600 *
600
300
600 *
300
1200
600
1500
750 **
600
300
1800
The terminal should be positioned so as to avoid products of combustion accumulating
in stagnant pockets around the building or entering into buildings. Care should also be
taken that the plume from the condensed flue gases does not cause a nuisance.
Distances measured to rim of terminal.
Clearances recommended by Grant UK
in accordance with British Standards
and Building Regulations.
!
NOTE
1. An opening means an openable
element, such as an openable
window, or a permanent opening
such as a permanently open air vent.
2. Notwithstanding the dimensions
given, a terminal should be at
least 300 mm from combustible
material, e.g. a window frame.
3. A way of providing protection of
combustible material would be to fit
a heat shield at least 750 mm wide.
Flue System
27