15
Grant Vortex External Module
4 - GENERAL BOILER INFORMATION
Fig. 7 - Clearances for flue terminals
Distances measured to rim of terminal.
Clearances recommended by Grant Engineering
(IRL) Limited in accordance with Building
Standards and Building Regulations.
Notes: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.
A Below gutters, eaves or balconies (with protection)
B Horizontally from a door, window or air vent
C Above ground, flat roof or balcony level
D Below gutters, eaves or balconies (without protection)
E From an external corner
F From a terminal facing the terminal
G From a surface facing the terminal
H Vertically from a terminal on the same wall
I Horizontally from a terminal on the same wall
J Directly below an opening, air brick, window, etc.
K From a vertical drain pipe or soil pipe
L From an internal corner
*600
600
300
*600
300
1200
600
1500
**750
600
300
300
Terminal position Min. distance
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.
Notes: * 75 mm with protection.
** Only applies if one or both terminals are balanced flues.
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