Flue Termination; Internal Flue Installation; Air Supply; Cupboard Or Compartment Ventilation - Vaillant ecoTEC plus Instructions For Installation And Servicing

3 General requirements
3.5.1

Flue termination

The following details refer to both flue systems.
a. The terminal must be located where the combustible
substances can escape freely at all times.
b. A plume of water vapour will sometimes be visible
from the flue terminal. Positions where this could be
a nuisance should be avoided.
c. If the terminal is fitted less than 2 m above a balcony,
above ground or above a flat roof to which people
have access then a suitable terminal guard must be
provided and fitted (made by Tower Flue Components,
Tonbridge, TN9 1TB, Model K3, plastic coated).
Fig. 3.6 Flue termination
Note!
Vertical flues must not terminate within
600mm of an openable window, air vent or
any other ventilation opening.
The flue assembly shall be so placed or shielded as to
prevent ignition or damage to any part of the building.
Terminal position
A Directly below an opening, above an opening or
horizontal to an opening, air brick, opening window,
etc.
B Below gutters, soil pipes or drain pipes
C Below eaves
D Below balconies
E From vertical drain pipes and soil pipes
F From internal or external corners
G Above ground, roof or balcony
H From a surface facing a terminal
I From a terminal facing a terminal
J From an opening in the car port (e.g. door, window)
into the dwelling
K Vertically from a terminal on the same wall
L Horizontally from a terminal on the same wall
M Distance from adjacent wall for vertical Flue
Table 3.1 Flue terminal position for a fan assisted
concentric flue
12
Note!
In addition, the terminal should not be nearer
than 150 mm to an opening in the building
fabric formed for the purpose of
accommodating a built-in element such as a
window.
BS 5440–1: It is recommended that the fanned flue
terminal should be positioned as follows:
a) at least 2 m from an opening in the building directly
opposite, and
b) so that the products of combustion are not directed
to discharge across a boundary.
1) Dimensions B, C and D: These clearances may be
reduced to 25 mm without affecting the
performance of the boiler. In order to ensure
that the condensate plume does not affect adjacent
surfaces the terminal should be extended as shown
in Fig. 3.7.
2) Dimension F:
This clearance may be reduced to 25 mm without
affecting the performance of the boiler. However,
in order to ensure that the condensate plume does
not affect adjacent surfaces a clearance of 300 mm
is preferred. For IE, recommendations are given in
the current edition of IS 813.
mm
300
Fig. 3.7 Flue termination under balcony/eves
3.5.2

Internal flue installation

The flue can be installed from inside the building when
75
access to the outside wall face is not practicable.
200
3.6

Air supply

200
Detailed recommendations for air supply are given in
25
BS 5440: Part 2.
300 It is not necessary to have an air vent in the room or
internal space in which the boiler is installed.
300
600
3.7

Cupboard or compartment ventilation

The boilers are very high efficiency appliances.
1200
As a consequence the heat loss from the appliance
1200
casing during operation is very low. For cupboard or
compartment installations it is therefore not necessary
to provide any high or low level permanent air vents
1500
for cooling purposes.
300
500

Installation and Servicing ecoTEC plus