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BEAM P
LUS FOR
N
EW
B
UILDINGS
I
NDOOR
E
NVIRONMENTAL
Q
UALITY
(I
EQ
)
V
ERSION
1.2
I
EQ
12 V
ENTILATION IN
C
OMMON
A
REAS
Copyright © 2012 BEAM Society Limited. All rights reserved.
Page 165
6
IEQ
6.4
V
ENTILATION
I
EQ
12 V
ENTILATION IN
C
OMMON
A
REAS
E
XCLUSIONS
Spaces covered under the section on IEQ 11 Localised Ventilation.
O
BJECTIVE
Ensure adequate ventilation in common areas and circulation routes
within premises and to avoid cross-contamination between areas.
C
REDITS ATTAINABLE
1 + 1 BONUS
P
REREQUISITES
Compliance with applicable regulations covering ventilation provisions in
buildings.
C
REDIT REQUIREMENT
a) Ventilation by any means
1 credit for demonstrating that all enclosed common areas in a building
are provided with adequate ventilation.
b) Use of natural ventilation
1 BONUS credit where the provision for ventilation is by natural means.
Assessment
The Client shall provide evidence in form of a report prepared by a
suitably qualified person detailing the design criteria that have been
adopted for each type of common area included in the development, and
the results of calculations, simulations and/or measurements in the
specified sample of spaces to demonstrate compliance with the
assessment criteria. Common areas include corridors, lift lobbies,
entrance lobbies, etc. Staircases shall be excluded from the assessment.
a) Ventilation by any means
Design ventilation rates shall be defined by the Client, but should comply
with recommendations from recognised authorities, e.g. BS 5925 [ 1],
ASHRAE 62 [2] or equivalent. Compliance shall be demonstrated by
measurements on a representative sample of each type of space,
including worst cases, under average wind conditions.
b) Use of natural ventilation
Where natural ventilation is employed it shall demonstrate that the
ventilation rate (a ACH of higher than 0.5) is achieved under average
wind conditions in at least 80% of the common areas, aggregated by
floor area. Compliance may be demonstrated by suitable commissioning
measurements such as a tracer gas test [3] on a representative sample
of spaces, including worst cases, or by appropriate modelling
techniques, such as wind tunnel test, CFD or other computer models [4,
5].
Outside air brought into common areas should be free from known or
potential localised sources of pollution (e.g. motor vehicle exhaust,
workshops, etc), and exhausted air should not contaminate public areas
or occupied areas.
B
ACKGROUND
The Buildings Department seeks to improve building design in the
1
BS 5929: 1991 (Amendment No. 1) Code of practice for Ventilation Principles and designing for Natural Ventilation. British
Standards Institute, London, 1995.
2
American Society of Heating, Refrigerating and Air Conditioning Engineers. ASHRAE 62-2007. Ventilation for Acceptable
Indoor Air Quality. American Society of Heating, Refrigerating and Air Conditioning Engineers. Atlanta, 2007.
3
ASTM International. E 741-00. Standard Test Method for Determining Air Change in a Single Zone by means of a tracer
Gas Dilution. 2000
4
ASTM International. ASTM E 2267-03. Specifying and Evaluating Performances of Single Family Attached and detached
Dwellings – Indoor Air Quality. 2003.
5
American Society of Heating, Refrigerating and Air Conditioning Engineers. ASHRAE Fundamentals Handbook Chapter
26. Atlanta 2001.