oSIST prEN 17291:2018

Fans - Procedures and methods to determine and evaluate the energy efficiency of non-residential unidirectional ventilation units

This document provides procedures and methods for measuring and calculating the energy efficiency and associated characteristics of non-residential unidirectional ventilation units when driven by electric motors.
Unidirectional ventilation units include roof fans and box fans.
This document includes unidirectional ventilation units with and without filters.
Additional air treatment items are considered in this document but are excluded in the determination of the efficiency of the product.
This document does not include:
-   residential unidirectional and bidirectional ventilation units,
-   non-residential bidirectional ventilation units.
NOTE 1   Residential unidirectional ventilation units are under the remit of CEN/TC 156/WG 2.
NOTE 2   Non-residential bidirectional ventilation units are under the remit of CEN/TC 156/WG 5.

Ventilatoren - Verfahren und Methoden zur Ermittlung und Beurteilung der Energieeffizienz von Ein-Richtung-Lüftungsgeräten im Nichtwohnbereich

Dieses Dokument behandelt Verfahren und Methoden für die Messung und Berechnung des Wirkungsgrads und damit verbundener Eigenschaften von elektrisch betriebenen unidirektionalen Lüftungsgeräten im Nichtwohnbereich.
Zu unidirektionalen Lüftungsgeräten gehören Dachventilatoren und Kastenventilatoren.
Dieses Dokument umfasst unidirektionale Lüftungsgeräte mit und ohne Filter.
Zusätzliche Anlagenteile zur Luftbehandlung werden in diesem Dokument behandelt, aber bei der Bestimmung des Wirkungsgrads des Produkts ausgeschlossen.
Dieses Dokument gilt nicht für
-   unidirektionale und bidirektionale Lüftungsgeräte im Wohnbereich,
-   bidirektionale Lüftungsgeräte im Nichtwohnbereich.
ANMERKUNG 1   Unidirektionale Lüftungsgeräte im Wohnbereich fallen unter die Zuständigkeit von CEN/TC 156/WG 2
ANMERKUNG 2   Bidirektionale Lüftungsgeräte im Nichtwohnbereich fallen unter die Zuständigkeit von CEN/TC 156/WG 5.

Ventilateurs - Procédures et méthodes de détermination du rendement énergétique des unités de ventilation unidirectionnelles pour le non résidentiel

Ventilatorji - Postopki in metode za ugotavljanje in vrednotenje energijske učinkovitosti enosmernih prezračevalnih enot za prezračevanje nestanovanjskih stavb

General Information

• Status: Not Published
• Public Enquiry End Date: 04-Jan-2019
• ICS: 23.120 - Ventilators. Fans. Air-conditioners
• Technical Committee: OGS - Heating for buildings
• Current Stage: 98 - Abandoned project (Adopted Project)
• Start Date: 23-Sep-2021
• Due Date: 28-Sep-2021
• Completion Date: 23-Sep-2021
• Directive: 1253/2014 - Commission Regulation (EU) No 1253/2014 of 7 July 2014 implementing Directive 2009/125/EC of the European Parliament and of the Council with regard to ecodesign requirements for ventilation units
• Directive: 1254/2014 - Commission Delegated Regulation (EU) No 1254/2014 of 11 July 2014 supplementing Directive 2010/30/EU of the European Parliament and of the Council with regard to energy labelling of residential ventilation units
• Directive: 2009/125/EC - Directive 2005/32/EC of the European Parliament and of the Council of 6 July 2005 establishing a framework for the setting of ecodesign requirements for energy-using products and amending Council Directive 92/42/EEC and Directives 96/57/EC and 2000/55/EC of the European Parliament and of the Council
• Mandate: M/537 - [C2015)8325] Standardisation request to the European Committee for Standardisation as regards ventilation units in support of Regulation (EU) No 1253/2014 and Delegated Regulation (EU) No 1254/2014
• Ref Project: prEN 17291 - Fans - Procedures and methods to determine and evaluate the energy efficiency of non-residential unidirectional ventilation units

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN 17291:2018
01-december-2018
[Not translated]
Fans - Procedures and methods to determine and evaluate the energy efficiency of non-
residential unidirectional ventilation units
Ventilatoren - Verfahren und Methoden zur Ermittlung und Beurteilung der
Energieeffizienz von Ein-Richtung-Lüftungsgeräten im Nichtwohnbereich
Ta slovenski standard je istoveten z: prEN 17291
ICS:
23.120 =UDþQLNL9HWUQLNL.OLPDWVNH Ventilators. Fans. Air-
QDSUDYH conditioners
oSIST prEN 17291:2018 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 17291:2018

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oSIST prEN 17291:2018


DRAFT
EUROPEAN STANDARD
prEN 17291
NORME EUROPÉENNE

EUROPÄISCHE NORM

October 2018
ICS 23.120
English Version

Fans - Procedures and methods to determine and evaluate
the energy efficiency of non-residential unidirectional
ventilation units
 Ventilatoren - Verfahren und Methoden zur Ermittlung
und Beurteilung der Energieeffizienz von Ein-
Richtung-Lüftungsgeräten im Nichtwohnbereich
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 156.

If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.


EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 17291:2018 E
worldwide for CEN national Members.

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Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Requirements . 16
4.1 Eco-design requirements . 16
4.1.1 General . 16
4.1.2 Identify the unit and if intended to be used with a filter . 16
4.2 Information requirements . 17
4.2.1 General . 17
4.2.2 Requirements . 17
5 Testing and calculation methods . 18
5.1 General . 18
5.2 Test method to determine the ventilation unit efficiency (UVU efficiency) in the
reference configuration without a filter . 18
5.2.1 General . 18
5.2.2 Ventilation unit efficiency (UVU efficiency) . 18
5.2.3 Nominal operating conditions . 19
5.3 Determination of internal specific fan power. 20
5.3.1 General . 20
5.3.2 Internal specific fan power calculation method for reference configuration unit with
filter . 20
5.3.3 Calculation with non-ventilation components . 21
6 Evaluation of conformity . 21
6.1 General . 21
6.2 Ventilation unit efficiency (ƞ ) . 21
vu
6.3 Internal Specific Fan Power (SFPint) . 21
6.4 Filter monitoring . 22
6.5 Information requirements . 22
7 Classification and designation . 22
8 Marking, labelling and packaging . 22
8.1 Marking . 22
8.2 Product information requirements on unidirectional ventilation units . 22
9 Installation and maintenance information . 22
Annex A (informative) How to use the standard . 24
A.1 Determine if the product is within scope and what should be applied . 24
Annex B (normative) Internal specific fan power (SFP ) . 25
int
B.1 General . 25
B.2 Method . 25
B.3 Example of calculation method . 30
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Annex C (informative) External leakage. 31
C.1 General . 31
C.2 Measurement . 31
Annex D (informative) Overall A-weighted casing sound power level. 36
D.1 General . 36
D.2 Definitions . 36
D.3 Requirements . 37
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of EU Directive 2009/125/EC and Commission Regulation (EC) No
1253/2014 . 40
Bibliography . 42
3

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European foreword
This document (prEN 17291:2018) has been prepared by Technical Committee CEN/TC 156 “Ventilation
for buildings”, the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.
This document has been prepared under a standardization request given to CEN by the European
Commission and the European Free Trade Association, and supports essential requirements of
EU Directive 2009/125/EC and Commission Regulation (EC) No 1253/2014.
For relationship with EU Directive 2009/125/EC, see informative Annex ZA, which is an integral part of
this document.
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1 Scope
This document provides procedures and methods for measuring and calculating the energy efficiency and
associated characteristics of non-residential unidirectional ventilation units when driven by electric
motors.
Unidirectional ventilation units include roof fans and box fans.
This document includes unidirectional ventilation units with and without filters.
Additional air treatment items are considered in this document but are excluded in the determination of
the efficiency of the product.
This document does not include:
— residential unidirectional and bidirectional ventilation units,
— non-residential bidirectional ventilation units.
NOTE 1 Residential unidirectional ventilation units are under the remit of CEN/TC 156/WG 2.
NOTE 2 Non-residential bidirectional ventilation units are under the remit of CEN/TC 156/WG 5.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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.
EN 779, Particulate air filters for general ventilation — Determination of the filtration performance
EN 1886, Ventilation for buildings — Air handling units — Mechanical performance
EN ISO 5801, Fans — Performance testing using standardized airways (ISO 5801)
prEN 17166, Fans — Procedures and methods to determine the energy efficiency for the electrical input
power range of 125 W up to 500 kW
EN ISO 12759, Fans — Efficiency classification for fans (ISO 12759)
EN ISO 13349, Fans — Vocabulary and definitions of categories (ISO 13349)
ISO 13347 (all parts), Industrial fans — Determination of fan sound power levels under standardized
laboratory conditions
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN ISO 5801 and prEN 17166 and
the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
5

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3.1
fan
rotary-bladed machine that receives mechanical energy and utilizes it by means of one or more impellers
fitted with blades to maintain a continuous flow of air or other gas passing through it and whose work
per unit mass does not normally exceed 25 kJ/kg
In this standard, the word fan means an assembly of an impeller, bearing, transmission, housing, motor
and other significant elements within a boundary as defined in prEN 17166 and a variable speed drive if
fitted
[SOURCE: EN ISO 13349:2010, definition 3.1.1]
[SOURCE: prEN 17166]
3.2
ventilation unit (VU)
electrically driven appliance equipped with at least one impeller, one motor and a casing
[SOURCE: Regulation (EU) No 1253/2014, article 2, definition (1)]
3.3
unidirectional ventilation unit (UVU)
ventilation unit producing an air flow in one direction only, either for exhaust or for supply
3.4
non-residential ventilation unit (NRVU)
3 3
ventilation unit where the maximum flow rate exceeds 250 m /h, excluding those between 250 m /h and
3
1 000 m /h where the manufacturer has declared it a residential ventilation unit only
Note 1 to entry: Based on definition Article 2 (3) of Regulation (EU) No 1253/2014.
3.5
housing
stationary part which interacts with the air stream passing through the impeller
Note 1 to entry: A housing could be a device around the impeller which guides the gas stream towards, through
and from the impeller.
Note 2 to entry: A housing may have additional parts included within the housing or attached to the housing to
affect the performance of the fan. Such as:
— inlet bell, also known as Venturi inlet, inlet cone, inlet radius;
— inlet guide vane;
— outlet guide vane;
— outlet diffuser.
Note 3 to entry: Additional parts are devices not listed above that provide an impact of the air power of the fan.
Note 4 to entry: A housing is also called a stator.
[SOURCE: prEN 17166:2017, definition 3.6]
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3.6
casing
element that is additional to the housing, see Figures 1, 2 and 3. The casing is all parts of the ventilation
unit in addition to the fan housing that interfere with the airflow

Key
1 impeller
2 housing
3 stator
4 motor
5 boundary
6 casing
Figure 1 — Diagram explaining casing and housing
7

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Key
1 impeller
3 stator
4 motor
5 boundary
6 casing
Figure 2 — NRVU-UVU with an impeller (box fan)
8

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Key
1 impeller
2 housing
3 stator
4 motor
5 boundary
6 casing
Figure 3 — Diagram explaining casing and housing for a roof mounted fan
Note 1 to entry: In prEN 17166 the ‘casing’ is called an ‘outer casing’.
3.7
boundary
region of the fan that encompasses the significant elements that affect the conversion of power (electrical
or mechanical) into air volume flow rate and pressure
[SOURCE: prEN 17166:2017, 5.3.2]
3.8
ventilation components
are defined in the reference configuration
3.9
additional non-ventilation components
components that are not part of the reference configuration and therefore are not part of the calculation
of SFP
int
Note 1 to entry: Additional non-ventilation components may be heating coils, cooling coils, humidifiers,
dehumidifiers, etc.
3.10
reference configuration of an NRVU-UVU
means a product configured with a casing and at least one fan with variable speed or multi-speed drive
(except for units less than 30 Watts and dual use units), and – in case the product is intended to be
equipped with a filter on the inlet-side – this filter shall be a clean filter
[SOURCE: adapted from Regulation (EU) No 1253/2014 Annex I.2 definition (4)]
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Note 1 to entry: For units supplying air the filter shall be grade F7 (EN 779) or have an efficiency on the
ePM10 ≥ 50 % (EN ISO 16890).
Note 2 to entry: For units exhausting air the filter shall be of an appropriate grade.
3.11
power


Key
  A drive/control electrical input power (P )
ed
1 VSD
  B motor input power (Pe)
2 motor
  C motor output power (P )
o
3 transmission
  D fan shaft power (Pa)
4 bearings (and other mechaniscal parts)
  E fan impeller power (Pr)
5 impeller and housing
  F fan air power (P )
u
10

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Figure 4 — Power diagram of driven system
Table 1 — Relationship between powers and efficiencies
Installation category A and C B and D
 Static efficiencies Total efficiencies
Powers
drive/control electrical input power η = P / P η = P / P
esd us ed ed u ed
(Ped)
motor input power (P ) η = P / P η = P / P
e es us e e u e
motor output power (P ) η = P / P η = P / P
o os us o o u o
fan shaft power (P ) η = P / P η = P / P
a as us a a u a
fan impeller power (P ) η = P / P η = P / P
r rs us r r u r

3.11.1
fan air power
P
u
also known as fan total air power; conventional output power which is the product of the mass flow rate
and the fan work per unit mass, or the product of the inlet volume flow rate, the compressibility
coefficient and the fan pressure
qp ×× k
fp
[SOURCE: EN ISO 12759:2015, 3.3.12]
3.11.2
fan static air power
Pus
conventional output power which is the product of the mass flow rate and the fan static work per unit
mass, or the product of the inlet volume flow rate, the compressibility coefficient and the fan static
pressure
qp ×× k
sf p
[SOURCE: EN ISO 12759:2015, 3.3.13]
3.12
motor input power
P
e
electrical input power supplied at the terminals of an electric motor drive without a variable speed drive
3.13
drive control electrical input power
P
ed
electrical input power measured at the input terminals to the variable speed drive of a motor
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3.14
electric input power of the ventilation unit
P
electrical power input of the ventilation unit including fans, motor, drives, including any motor control
equipment in the reference configuration
[SOURCE: adapted from Regulation (EU) No 1253/2014 Annex I.2 definition (1)]
Note 1 to entry: In prEN 17166 (new fan efficiency standard) this is defined as ‘motor input power Pe if control
equipment such as a variable speed drive is not included and defined as ‘drive control electrical input power P if
ed
control equipment such as variable speed drive is included.
3.15
nominal electric input power of fan
P
fan,ext
electrical power input of the fan, including any motor control equipment, measured outside of the UVU,
at the nominal flowrate and at the same speed required, when inside the unit, to provide the nominal
external pressure. It is used to calculate SFP
int
[SOURCE: adapted from Transitional method for determine of internal specific fan power of ventilation
units, SFP , Danish Technology Institute, ISBN 978087-998971-1]
int
3.16
efficiency
throughout this standard is the ratio between static air power and electrical input power
3.17
fan static efficiency
ƞ
s
means the static efficiency at the best efficiency point as defined in Regulation (EU) No 327/2011
[SOURCE: adapted from Regulation (EU) No 327/2011]
Note 1 to entry: Referred to as ƞ and ƞ in prEN 17166.
es esd
3.18
fan efficiency
ƞ
fan
air power P divided by the nominal electric input power of fan P as given by the formula;
us fan,ext
p
us
η =
fan
p
fan,ext
is the static efficiency including motor and drive efficiency of the individual fan(s) determined at nominal
airflow rate and speed as defined by unit test
[SOURCE: from Regulation (EU) No 1253/2014 Annex I.2 definition (2)]
Note 1 to entry: This definition is specific to Regulation (EU) No 1253/2014 and this standard. It is not the same
fan efficiency as defined in EN ISO 5801 and prEN 17166 fan efficiency standard.
Note 2 to entry: This definition of efficiency shall only be used in the determination of the SFPint of a UVU.
Note 3 to entry: This quantity in other existing EN Standards is defined fan static efficiency.
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Note 4 to entry: Also referenced as ƞ in the transitional document (Transitional method, Danish Technology
s,fan
Institute, ISBN 978087-998971-1) of the EU.
3.19
ventilation unit efficiency (UVU efficiency)
ƞ
vu
specific minimum efficiency requirements for UVU’s
Note 1 to entry: In Regulation (EU) No 1253/2014 the term “fan efficiency” is used for “ventilation unit
efficiency”.
[SOURCE: adapted from Regulation (EU) No 1253/2014 Annex I.2 definition (5)]
3.20
fan pressure

3.20.1
fan total pressure
p
f
For velocities (v ) which are below 65 m/s the values of total pressure and stagnation pressure are
2
practically the same
The fan total pressure is the difference between total pressures at the fan outlet and the fan inlet
pp  − p
f tot 2 tot1
For v2.ref ≥65 m/s the total pressures shall be replaced by stagnation pressures
pp  − p
f sg21sg
difference between the stagnation pressures at the fan outlet and the fan inlet
Note 1 to entry: For the establishment of the value 65 m/s see Clause 13 of EN ISO 5801:2018.
Note 2 to entry: In other standards fan total pressure is also expressed as fan pressure.
3.20.2
fan dynamic pressure
p
fd
dynamic pressure of the fan, defined at the fan outlet with the average velocity
2
v
2
p p ρ ×
fd d22
2
[SOURCE: EN ISO 5801:2018, definition 3.32]
3.20.3
fan static pressure
p
fs
for velocities (v ) below 65 m/s the fan static pressure is the difference between the static pressure at the
2
fan outlet and the total pressure at the fan inlet
13
= =
=
=

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p= pp − =p − p − p =p − p
fs 2 tot1 tot 2 d2 tot1 f fd
for v .ref ≥65 m/s the total pressures shall be replaced by stagnation pressures
2
p= pp − =p − p × f − p =p −×p f
fs 2 sg1 sg22d M2 sg1 f fd M2
difference between the static pressure at the fan outlet and the stagnation pressure at the fan inlet
Note 1 to entry: For the establishment of the value 65 m/s see Clause 13 of EN ISO 5801:2018.
3.21
static pressure difference
p
s,fan
is the static pressure difference of the fan inside of a UVU but measured outside of the unit at the same
speed and nominal flow rate
Note 1 to entry: Referenced as ∆p in the Regulation (EU) No 1253/2014 and the transitional methods
s,Fan
document.
[SOURCE: adapted from Transitional method for determine of internal specific fan power of ventilation
units, SFP , Danish Technology Institute, ISBN 978087-998971-1]
int
3.21.1
external static pressure
p
s,exts
external static pressure difference between the outlet and inlet of the unit, see Table 2
pp  − p
s,ext s discharge s suction
( ) ( )
[SOURCE: Regulation (EU) No 1253/2014 Annex I.2 definition (7)]
Note 1 to entry: This does not align with EN ISO 5801.
3.22
internal pressure drop of ventilation components
p
s,int
sum of internal static pressure drops of ventilation components of a reference configuration of a UVU at
nominal flow rate

p p − p
s,int s,,fan s ext
Note 1 to entry: Referenced as ∆ps,int in the and the transitional methods document.
[SOURCE: adapted from Regulation (EU) No 1253/2014 Annex I.2 definition (9) and section 5.2.3 of the
document Transitional method, Danish Technology Institute, ISBN 978087-998971-1]
3.23
internal pressure drop of additional non-ventilation components
p
s,add
sum of the static pressure drops of additional non-ventilation components not being part of the reference
configuration of a UVU at nominal flow rate
14
=
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Note 1 to entry: Referenced as ∆p in the Regulation (EU) No 1253/2014 and the transitional methods
s,add
document.
[SOURCE: adapted from Regulation (EU) No 1253/2014 Annex I.2 definition (10) and section 5.2.3 of the
document Transitional method, Danish Technology Institute, ISBN 978087-998971-1]
3.24
external leakage rate
%
air leakage through the casing compared to the declared nominal flow rate of the NRVU-UVU. Annex C
describes a method to determine the external leakage rate
3.25
internal Specific Fan Power
SFP
int
ratio between the internal pressure drop of the ventilation components and the fan efficiency for the
reference configuration
pp−
P
s.fan s ext
SFP ×
int
η P
fan fan,ext
[SOURCE: adapted from “Transitional method for determination of internal specific fan power of
ventilation units”, ISBN-978-87-998971-0-0]
3.26
variable speed drive
VSD
means an electronic power converter integrated - or functioning as one system - with the motor and the
fan, that continuously adapts the electrical power supplied to the electric motor in order to control the
mechanical power output of the motor according to the torque-speed characteristic of the load being
driven by the motor
[SOURCE: adapted from new EN standard]
3.27
multi speed drive
MSD
means a fan motor that can be operated at three or more fixed speeds plus zero (off)
[SOURCE: Regulation (EU) No 1253/2014]
3.28
volume flow rate
q
V
mass flow rate divided by the density at fan inlet
q
m
q =
v
ρ
[SOURCE: adapted from EN ISO 5801:2018, definition 3.23]
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3.28.1
nominal flow rate
q
nom
declared design flow rate of a UVU at standard air conditions where the minimum fan efficiency (ƞ ) is
VU
met at maximum rated fan speed
[SOURCE: adapted from Regulation (EU) No 1253/2014 Annex I.2 definition (6)]
3.29
face velocity
v
fx
volume flow rate at the specified airway cross-section divided by the cross-sectional area, A , given by
x
the following formula
q
Vx
v =
fx
A
x
where A is the free unit area of the filter, if fitted or intended to be fitted with a filter, or the internal
x
cross-sectional area of the UVU if not fitted with or intended to be fitted with a filter
[SOURCE: adapted from EN ISO 5801; average velocity at section x, and section 3.3 of the document
Transitional method, Danish Technology Institute, ISBN 978087-998971-1]
Note 1 to entry: This is the mean value, over time, of the average component of the gas velocity normal to that
section. [SOURCE: adapted from EN ISO 5801]
Note 2 to entry: Average velocity is expressed in metres per second. [SOURCE: adapted from EN ISO 5801]
4 Requirements
4.1 Eco-design requirements
4.1.1 General
All ventilation units, except dual use units, shall be equipped with a multi-speed drive or a variable speed
drive.
State the fan efficiency of the non-residential unidirectional ventilation unit.
State the internal specific fan power of ventilation components if the non-residential unidirectional
ventilation unit is intended to be used with a filter.
If the electrical input power is less than 30 Watts then the specific Eco-design requirements do not apply,
but there is a requirement to provide information, see 4.2.
UVUs shall be tested and calculated using a “reference configuration” of the product.
Dual use units shall be tested and calculated in the ventilation mode.
4.1.2 Identify the unit and if intended to be used with a filter
3
All UVUs having a maximum flow rate equal or larger than 1 000 m /h shall be considered NRVUs.
3
All UVUs having a maximum flow rate equal or less than 250 m /h shall be considered RVUs.
...