SIST ISO 9972:2012
Thermal performance of buildings - Determination of air permeability of buildings - Fan pressurization method
Thermal performance of buildings - Determination of air permeability of buildings - Fan pressurization method
ISO 9972:2006 is intended for the measurement of the air permeability of buildings or parts of buildings in the field. It specifies the use of mechanical pressurization or depressurization of a building or part of a building. It describes the measurement of the resulting air flow rates over a range of indoor-outdoor static pressure differences.
ISO 9972:2006 is intended for the measurement of the air leakage of building envelopes of single-zone buildings. For the purpose of ISO 9972:2006, many multi-zone buildings can be treated as single-zone buildings by opening interior doors or by inducing equal pressures in adjacent zones.
ISO 9972:2006 does not address evaluation of air permeability through individual components.
Performance thermique des bâtiments - Détermination de la perméabilité à l'air des bâtiments - Méthode de pressurisation par ventilateur
Toplotne značilnosti stavb - Ugotavljanje tesnosti obodnih konstrukcij - Metoda tlačne razlike z uporabo ventilatorja
Ta mednarodni standard je namenjen merjenju tesnosti obodnih konstrukcij ali delov obodnih konstrukcij na tem področju. Določa uporabo mehanskega ustvarjanja nadtlaka ali podtlaka obodnih konstrukcij ali delov obodnih konstrukcij. Opisuje merjenje pretoka zraka prek niza razlik v zunanjem in notranjem statičnem tlaku.
Ta mednarodni standard je namenjen merjenju puščanja zraka fasad obodnih konstrukcij pri enoconskih obodnih konstrukcijah. Za namen tega mednarodnega standarda se lahko številne večconske obodne konstrukcije obravnava kot enoconske obodne konstrukcije z odprtjem notranjih vrat ali z vzpostavitvijo enakega tlaka v sosednjih conah.
Ne obravnava vrednotenja tesnosti prek posameznih sestavnih delov.
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Performance thermique des bâtiments -- Détermination de la perméabilité à l'air des bâtiments -- Méthode de pressurisation par ventilateurThermal performance of buildings -- Determination of air permeability of buildings -- Fan pressurization method91.120.10Toplotna izolacija stavbThermal insulationICS:Ta slovenski standard je istoveten z:ISO 9972:2006oSIST ISO 9972:2010en01-junij-2010oSIST ISO 9972:2010SLOVENSKI
STANDARD
oSIST ISO 9972:2010
Reference numberISO 9972:2006(E)© ISO 2006
INTERNATIONAL STANDARD ISO9972Second edition2006-05-01Thermal performance of buildings — Determination of air permeability of buildings — Fan pressurization method Performance thermique des bâtiments — Détermination de la perméabilité à l'air des bâtiments — Méthode de pressurisation par ventilateur
oSIST ISO 9972:2010
©
ISO 2006 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56 • CH-1211 Geneva 20 Tel.
+ 41 22 749 01 11 Fax
+ 41 22 749 09 47 E-mail
copyright@iso.org Web
www.iso.org Published in Switzerland
ii © ISO 2006 – All rights reserved
oSIST ISO 9972:2010
Description of equipment used to pressurize buildings.14 Annex B (informative)
Dependence of air density on temperature, dew point and barometric pressure.16 Annex C (informative)
Recommended procedure for estimating uncertainty in derived quantities.17 Annex D (informative)
Beaufort scale for wind force (extract).20
oSIST ISO 9972:2010
oSIST ISO 9972:2010
INTERNATIONAL STANDARD ISO 9972:2006(E) © ISO 2006 – All rights reserved 1Thermal performance of buildings — Determination of air permeability of buildings — Fan pressurization method 1 Scope This International Standard is intended for the measurement of the air permeability of buildings or parts of buildings in the field. It specifies the use of mechanical pressurization or depressurization of a building or part of a building. It describes the measurement of the resulting air flow rates over a range of indoor-outdoor static pressure differences. This International Standard is intended for the measurement of the air leakage of building envelopes of single-zone buildings. For the purpose of this International Standard, many multi-zone buildings can be treated as single-zone buildings by opening interior doors or by inducing equal pressures in adjacent zones. It does not address evaluation of air permeability through individual components. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 6781, Thermal Insulation — Qualitative detection of thermal irregularities in building envelopes — Infrared method ISO 7345, Thermal Insulation — Physical quantities and definitions ISO 13790:2004, Thermal performance of buildings — Calculation of energy use for space heating and cooling 3 Terms, definitions and symbols 3.1 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 7345 and the following apply. 3.1.1 air leakage rate air flow rate across the building envelope NOTE This movement includes flow through joints, cracks and porous surfaces, or a combination thereof, induced by the air-moving equipment used in this standard (see Clause 4). 3.1.2 internal volume deliberately heated, cooled or mechanically ventilated space within a building or part of a building subject to the measurement, generally not including the attic space, basement space and attached structures oSIST ISO 9972:2010
oSIST ISO 9972:2010
...
SLOVENSKI STANDARD
01-februar-2012
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WODþQHUD]OLNH]XSRUDERYHQWLODWRUMD
Thermal performance of buildings - Determination of air permeability of buildings - Fan
pressurization method
Performance thermique des bâtiments - Détermination de la perméabilité à l'air des
bâtiments - Méthode de pressurisation par ventilateur
Ta slovenski standard je istoveten z: ISO 9972:2006
ICS:
91.120.10 Toplotna izolacija stavb Thermal insulation
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
INTERNATIONAL ISO
STANDARD 9972
Second edition
2006-05-01
Thermal performance of buildings —
Determination of air permeability of
buildings — Fan pressurization method
Performance thermique des bâtiments — Détermination de la
perméabilité à l'air des bâtiments — Méthode de pressurisation par
ventilateur
Reference number
©
ISO 2006
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.
© ISO 2006
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2006 – All rights reserved
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and symbols. 1
4 Apparatus . 3
5 Measurement procedure . 4
6 Expression of results . 8
7 Test report . 12
8 Uncertainty . 13
Annex A (informative) Description of equipment used to pressurize buildings. 14
Annex B (informative) Dependence of air density on temperature, dew point and barometric
pressure. 16
Annex C (informative) Recommended procedure for estimating uncertainty in derived quantities. 17
Annex D (informative) Beaufort scale for wind force (extract) . 20
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 9972 was prepared by Technical Committee ISO/TC 163, Thermal performance and energy use in the
built environment, Subcommittee SC 1, Test and measurement methods.
This second edition cancels and replaces the first edition (ISO 9972:1996), which has been technically revised.
iv © ISO 2006 – All rights reserved
Introduction
The fan-pressurization method is intended to characterize the air permeability of the building envelope or parts
thereof. It can be used
a) to measure the air permeability of a building or part thereof for compliance with a design air-tightness
specification;
b) to compare the relative air permeability of several similar buildings or parts of buildings;
c) to identify the leakage sources;
d) to determine the air-leakage reduction resulting from individual retrofit measures applied incrementally to
an existing building or part of building.
The fan-pressurization method is suitable for the respective diagnostic purposes. Although the air infiltration
and exfiltration cannot be measured directly, the results of this method can also be used to estimate with
adequate precision by means of calculation both the mean infiltration through unintended leakages and the
mean air flow through intended air flow devices from outside, in relation to the pressure conditions to be
expected within the building.
This method does not measure the air-infiltration rate of a building. The results of the fan-pressurization test
can be used to estimate the air infiltration by means of calculation. Other methods are applicable when it is
desired to obtain a direct measurement of the air infiltration rate. It is better to use the fan-pressurization
method for diagnostic purposes and measure the actual infiltration rate with tracer gas methods. A single
tracer gas measurement gives limited information on the performance of ventilation and infiltration of buildings.
This method applies to measurements of air flow through the construction from outside to inside or vice versa.
It does not apply to air flow measurements from outside through the construction and from other places within
the construction back to outside.
The proper use of this International Standard requires a knowledge of the principles of air flow and pressure
measurements. Ideal conditions for the test described in this standard are small temperature differences and
low wind speeds. For tests conducted in the field, it needs to be recognized that field conditions can be less
than ideal. Nevertheless, strong winds and large indoor-outdoor temperature differences should be avoided.
INTERNATIONAL STANDARD ISO 9972:2006(E)
Thermal performance of buildings — Determination of air
permeability of buildings — Fan pressurization method
1 Scope
This International Standard is intended for the measurement of the air permeability of buildings or parts of
buildings in the field. It specifies the use of mechanical pressurization or depressurization of a building or part
of a building. It describes the measurement of the resulting air flow rates over a range of indoor-outdoor static
pressure differences.
This International Standard is intended for the measurement of the air leakage of building envelopes of
single-zone buildings. For the purpose of this International Standard, many multi-zone buildings can be
treated as single-zone buildings by opening interior doors or by inducing equal pressures in adjacent zones.
It does not address evaluation of air permeability through individual components.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 6781, Thermal Insulation — Qualitative detection of thermal irregularities in building envelopes — Infrared
method
ISO 7345, Thermal Insulation — Physical quantities and definitions
ISO 13790:2004, Thermal performance of buildings — Calculation of energy use for space heating and
cooling
3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 7345 and the following apply.
3.1.1
air leakage rate
air flow rate across the building envelope
NOTE This movement includes flow through joints, cracks and porous surfaces, or a combination thereof, induced by
the air-moving equipment used in this standard (see Clause 4).
3.1.2
internal volume
deliberately heated, cooled or mechanically ventilated space within a building or part of a building subject to
the measurement, generally not including the attic space, basement space and attached structures
3.1.3
building envelope
boundary or barrier separating the internal volume subject to the test from the outside environment or another
part of the building
3.1.4
air change rate at reference pressure
air leakage rate per internal volume at the reference pressure difference across the building envelope
NOTE The reference pressure is usually 50 Pa.
3.1.5
air permeability
air leakage rate per envelope area at the reference pressure difference across the building envelope
NOTE The reference pressure is usually 50 Pa.
3.1.6
specific leakage rate
air leakage rate per net floor area at the reference pressure difference across the building envelope
NOTE A pressure difference of 50 Pa is the most common.
3.1.7
leakage area
area corresponding to air leakage rate at the reference pressure difference across the building envelope
NOTE A pressure difference of 10 Pa is the most common.
3.1.8
specific leakage area
leakage area per net floor area or envelope area at the test reference pressure difference across the building
envelope
3.2 Symbols
Symbol Quantity Unit
2 2
a specific leakage area at 10 Pa m /m
A envelope area m
E
A floor area m
F
A leakage area m
L
3 n
C air flow coefficient m /(h⋅Pa )
env
3 n
C air leakage coefficient m /(h⋅Pa )
L
–1
n air change rate at 50 Pa h
p pressure Pa
p uncorrected barometric pressure Pa
bar
p partial vapour pressure of water Pa
v
p saturation vapour pressure of water Pa
vs
Q tracer gas injection rate m /h
q air permeability at 50 Pa m /h
q air permeability
a50
2 © ISO 2006 – All rights reserved
Symbol Quantity Unit
q air flow rate through the building envelope m /h
env
q air flow rate through the building envelope m /s
env,s
q air leakage rate at 50 Pa m /h
L50
q measured air flow rate m /h
m
3 2
q air permeability at 50 Pa m /(h⋅m )
p50
q air leakage rate at a specified reference pressure m /h
pr
difference
q readings of air flow rate m /h
r
V internal volume m
3 2
w specific leakage rate at 50 Pa m /(h⋅m )
∆p induced pressure difference Pa
∆p zero flow pressure difference (average) Pa
∆p ; ∆p zero-flow pressure difference before and after the Pa
0,1 0,2
test (air moving equipment closed)
∆p measured pressure difference Pa
m
∆p reference pressure Pa
r
Φ relative humidity –
Τ absolute temperature K
Τ external air absolute temperature K
e
Τ internal air absolute temperature K
int
ρ air density kg/m
ρ external air density kg/m
e
ρ internal air density kg/m
int
4 Apparatus
4.1 General
The following description of apparatus is general in nature. Any arrangement of equipment using the same
principles and capable of performing the test procedure within the allowable tolerances is permitted. Examples
of equipment configurations commonly used are indicated in Annex A.
Periodic calibration of the measurement system, used in this test method, according to manufacturer
specifications or to standardized quality insurance systems is required.
4.2 Equipment
4.2.1 Air-moving equipment
This includes any device that is capable of inducing a specific range of positive and negative pressure
differences across the building envelope or part thereof. The system shall provide a constant air flow at each
...
INTERNATIONAL ISO
STANDARD 9972
Second edition
2006-05-01
Thermal performance of buildings —
Determination of air permeability of
buildings — Fan pressurization method
Performance thermique des bâtiments — Détermination de la
perméabilité à l'air des bâtiments — Méthode de pressurisation par
ventilateur
Reference number
©
ISO 2006
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.
© ISO 2006
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2006 – All rights reserved
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and symbols. 1
4 Apparatus . 3
5 Measurement procedure . 4
6 Expression of results . 8
7 Test report . 12
8 Uncertainty . 13
Annex A (informative) Description of equipment used to pressurize buildings. 14
Annex B (informative) Dependence of air density on temperature, dew point and barometric
pressure. 16
Annex C (informative) Recommended procedure for estimating uncertainty in derived quantities. 17
Annex D (informative) Beaufort scale for wind force (extract) . 20
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 9972 was prepared by Technical Committee ISO/TC 163, Thermal performance and energy use in the
built environment, Subcommittee SC 1, Test and measurement methods.
This second edition cancels and replaces the first edition (ISO 9972:1996), which has been technically revised.
iv © ISO 2006 – All rights reserved
Introduction
The fan-pressurization method is intended to characterize the air permeability of the building envelope or parts
thereof. It can be used
a) to measure the air permeability of a building or part thereof for compliance with a design air-tightness
specification;
b) to compare the relative air permeability of several similar buildings or parts of buildings;
c) to identify the leakage sources;
d) to determine the air-leakage reduction resulting from individual retrofit measures applied incrementally to
an existing building or part of building.
The fan-pressurization method is suitable for the respective diagnostic purposes. Although the air infiltration
and exfiltration cannot be measured directly, the results of this method can also be used to estimate with
adequate precision by means of calculation both the mean infiltration through unintended leakages and the
mean air flow through intended air flow devices from outside, in relation to the pressure conditions to be
expected within the building.
This method does not measure the air-infiltration rate of a building. The results of the fan-pressurization test
can be used to estimate the air infiltration by means of calculation. Other methods are applicable when it is
desired to obtain a direct measurement of the air infiltration rate. It is better to use the fan-pressurization
method for diagnostic purposes and measure the actual infiltration rate with tracer gas methods. A single
tracer gas measurement gives limited information on the performance of ventilation and infiltration of buildings.
This method applies to measurements of air flow through the construction from outside to inside or vice versa.
It does not apply to air flow measurements from outside through the construction and from other places within
the construction back to outside.
The proper use of this International Standard requires a knowledge of the principles of air flow and pressure
measurements. Ideal conditions for the test described in this standard are small temperature differences and
low wind speeds. For tests conducted in the field, it needs to be recognized that field conditions can be less
than ideal. Nevertheless, strong winds and large indoor-outdoor temperature differences should be avoided.
INTERNATIONAL STANDARD ISO 9972:2006(E)
Thermal performance of buildings — Determination of air
permeability of buildings — Fan pressurization method
1 Scope
This International Standard is intended for the measurement of the air permeability of buildings or parts of
buildings in the field. It specifies the use of mechanical pressurization or depressurization of a building or part
of a building. It describes the measurement of the resulting air flow rates over a range of indoor-outdoor static
pressure differences.
This International Standard is intended for the measurement of the air leakage of building envelopes of
single-zone buildings. For the purpose of this International Standard, many multi-zone buildings can be
treated as single-zone buildings by opening interior doors or by inducing equal pressures in adjacent zones.
It does not address evaluation of air permeability through individual components.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 6781, Thermal Insulation — Qualitative detection of thermal irregularities in building envelopes — Infrared
method
ISO 7345, Thermal Insulation — Physical quantities and definitions
ISO 13790:2004, Thermal performance of buildings — Calculation of energy use for space heating and
cooling
3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 7345 and the following apply.
3.1.1
air leakage rate
air flow rate across the building envelope
NOTE This movement includes flow through joints, cracks and porous surfaces, or a combination thereof, induced by
the air-moving equipment used in this standard (see Clause 4).
3.1.2
internal volume
deliberately heated, cooled or mechanically ventilated space within a building or part of a building subject to
the measurement, generally not including the attic space, basement space and attached structures
3.1.3
building envelope
boundary or barrier separating the internal volume subject to the test from the outside environment or another
part of the building
3.1.4
air change rate at reference pressure
air leakage rate per internal volume at the reference pressure difference across the building envelope
NOTE The reference pressure is usually 50 Pa.
3.1.5
air permeability
air leakage rate per envelope area at the reference pressure difference across the building envelope
NOTE The reference pressure is usually 50 Pa.
3.1.6
specific leakage rate
air leakage rate per net floor area at the reference pressure difference across the building envelope
NOTE A pressure difference of 50 Pa is the most common.
3.1.7
leakage area
area corresponding to air leakage rate at the reference pressure difference across the building envelope
NOTE A pressure difference of 10 Pa is the most common.
3.1.8
specific leakage area
leakage area per net floor area or envelope area at the test reference pressure difference across the building
envelope
3.2 Symbols
Symbol Quantity Unit
2 2
a specific leakage area at 10 Pa m /m
A envelope area m
E
A floor area m
F
A leakage area m
L
3 n
C air flow coefficient m /(h⋅Pa )
env
3 n
C air leakage coefficient m /(h⋅Pa )
L
–1
n air change rate at 50 Pa h
p pressure Pa
p uncorrected barometric pressure Pa
bar
p partial vapour pressure of water Pa
v
p saturation vapour pressure of water Pa
vs
Q tracer gas injection rate m /h
q air permeability at 50 Pa m /h
q air permeability
a50
2 © ISO 2006 – All rights reserved
Symbol Quantity Unit
q air flow rate through the building envelope m /h
env
q air flow rate through the building envelope m /s
env,s
q air leakage rate at 50 Pa m /h
L50
q measured air flow rate m /h
m
3 2
q air permeability at 50 Pa m /(h⋅m )
p50
q air leakage rate at a specified reference pressure m /h
pr
difference
q readings of air flow rate m /h
r
V internal volume m
3 2
w specific leakage rate at 50 Pa m /(h⋅m )
∆p induced pressure difference Pa
∆p zero flow pressure difference (average) Pa
∆p ; ∆p zero-flow pressure difference before and after the Pa
0,1 0,2
test (air moving equipment closed)
∆p measured pressure difference Pa
m
∆p reference pressure Pa
r
Φ relative humidity –
Τ absolute temperature K
Τ external air absolute temperature K
e
Τ internal air absolute temperature K
int
ρ air density kg/m
ρ external air density kg/m
e
ρ internal air density kg/m
int
4 Apparatus
4.1 General
The following description of apparatus is general in nature. Any arrangement of equipment using the same
principles and capable of performing the test procedure within the allowable tolerances is permitted. Examples
of equipment configurations commonly used are indicated in Annex A.
Periodic calibration of the measurement system, used in this test method, according to manufacturer
specifications or to standardized quality insurance systems is required.
4.2 Equipment
4.2.1 Air-moving equipment
This includes any device that is capable of inducing a specific range of positive and negative pressure
differences across the building envelope or part thereof. The system shall provide a constant air flow at each
pressure difference for the period required to obtain readings of air flow rate.
4.2.2 Pressure-measuring device
This includes any instrument capable of measuring pressure differences with an accuracy of ± 2 Pa in the
range of 0 Pa to 100 Pa.
4.2.3 Air flow rate measuring system
This includes any device capable of measuring air flow rate within ± 7 % of the reading.
Care shall be taken if the principle underlying the measurement of volumetric flow rate is an orifice. The
reading of the air flow rate shall be corrected according to air density (see manufacturers' specifications).
4.2.4 Temperature-measuring device
This includes any instrument capable of measuring temperature to an accuracy of ± 1 K.
5 Measurement procedure
5.1 Measurement conditions
5.1.1 General
There are two methods for this measurement procedure: depressurization or pressurization of a building or
part of a building. Regardless of which metho
...
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