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BEAM P
LUS FOR
E
XISTING
B
UILDINGS
I
NDOOR
E
NVIRONMENTAL
Q
UALITY
(I
EQ
)
V
ERSION
1.2
I
EQ
13 V
ENTILATION IN
C
OMMON
A
REAS
Copyright © 2012 BEAM Society Limited. All rights reserved.
Page 130
6
IEQ
6.4
V
ENTILATION
I
EQ
13 V
ENTILATION IN
C
OMMON
A
REAS
E
XCLUSIONS
Spaces covered under the section on IEQ 12 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.
A
SSESSMENT
The Client shall provide evidence in the form of a report prepared by a
suitably qualified person detailing the performance criteria that have
been adopted for each type of common area included in the building, and
the results of 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 demonstrated that the
ventilation rate (ACH of higher than 0.5) specified 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. In the case of
naturally ventilated spaces, measurements should be made under
conditions when windows are closed and purpose designed ventilators
are open.
Compliance is conditional that outside air brought in to 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.
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 62-2001. Ventilation for Acceptable
Indoor Air Quality. American Society of Heating, Refrigerating and Air Conditioning Engineers. Atlanta, 2001.
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