Ventilation Requirements - Biasi RIVA OV M110.18SM/OV User Manual And Installation Instructions

f) Where the lowest part of the terminal is fitted
less than 2 m (78 in) above the ground, above
a balcony or above a flat roof to which people
have access, the terminal MUST be protected
by a purpose designed terminal guard.
g) The air inlet / flue outlet MUST NOT be closer
than 25 mm (1 in) to combustible material.
h) Condensing appliances have a tendency to
form a plume of water vapour at the terminal
under certain operating conditions. This is
normal but positions where this would cause
damage or a nuisance should be avoided.
Consideration should be given to the
dispersal of the plume in terms of adjacent
surfaces and neighbouring properties. A
special flue terminal, is available to raise the
flue discharge point; use of this terminal will
limit the maximum flue length available. For
further information contact: BIASI UK Ltd
Technical helpline: 0121 506 1350.
3.4

Ventilation Requirements

Detailed recommendations for air supply are
given in BS 5440-2.
The following notes are for general guidance.
a) It is not necessary to have a purpose
provided air vent in the room or internal space
in which a room-sealed appliance is installed.
b) Cupboard or compartment ventilation is not
necessary for a room-sealed appliance
providing that the minimum clearances are
maintained.
c) If the appliance is installed in a room or
internal space with other opened flued
appliances, the aggregate maximum rated
input shall be used to determine the air vent
free-area. (BS 5440-2 Table 2).
d) Where an open flued system is used, and the
flue duct air inlet is within a compartment
then high and low level air vents are
necessary in the compartment, the size of the
vents should be calculated in accordance
with BS 5440-2 Table 2.
12
The minimum acceptable spacing from the
terminal to obstructions and ventilation openings
are specified in Fig. 5.
Fig. 5.
Terminal Position
A. Directly below a window or other opening. . 300
B. Below gutters, soil pipes or drain pipes. . . . . 75
C. Below eaves . . . . . . . . . . . . . . . . . . . . . . . . . 200
D. Below balconies * . . . . . . . . . . . . . . . . . . . . 2500
E. Below car port roof . . . . . . . . . . . . . . . . . . . . NO
F. From vertical drain pipes and soil pipes . . . 150
G. From internal corners
H. From external corners . . . . . . . . . . . . . . . . . 300
I. Above ground or balcony level. . . . . . . . . . . 300
J. From a surface facing a terminal . . . . . . . . 2500
K. From a terminal facing a terminal. . . . . . . . 2500
L. From an opening in the car port
(e.g. door, window) into dwelling. . . . . . . . . . NO
M. Vertically from a terminal in the same wall . . 500
N. Horizontally from a terminal in the same wall300
O. Above the roof pitch with roof slope less
than or equal to 30º . . . . . . . . . . . . . . . . . . . 350
Above the roof pitch with roof slope
more than 30º . . . . . . . . . . . . . . . . . . . . . . . . 600
P. From wall face . . . . . . . . . . . . . . . . . . . . . . . 600
Q. From, above or to side of an opening . . . . . 300
* Wherever practicable to do so, the flue should be
extended beyond the perimeter of the balcony.
** Consideration should be given to adding
protection against condensate to the adjacent
structure
mm
** . . . . . . . . . . . . . . . 1000