EN 15780:2011
(Main)Ventilation for buildings - Ductwork - Cleanliness of ventilation systems
Ventilation for buildings - Ductwork - Cleanliness of ventilation systems
This European Standard applies to both new and existing ventilation and air conditioning systems and specifies the assessment criteria of cleanliness, cleaning procedures of these systems, and the validation of the effectiveness of cleaning applies also to products, which conform to EN 1505, EN 1506, EN 13053, EN 13180 and EN 13403, used in air conditioning and ventilation systems for human occupancy defined in the scope of CEN/TC 156. This European Standard does not apply to installations for industrial processes.
Cleanliness of ventilation systems is considered important for human comfort and health, energy consumption, system service life and for cleanliness of operations or processes carried out in the ventilated area.
Considerations for change of component as an alternative for cleaning (e.g. in case of flexible ducts and air filters) are also included.
This European Standard specifies general requirements and procedures necessary in assessing and maintaining the cleanliness of ducted ventilation, including:
- cleanliness quality classification;
- how to assess the need for cleaning (visual, measurements);
- assessment frequency (general guidance); guidance of system inspections in accordance with EN 15239, and EN 15240 when relevant;
- selection of cleaning method – to be in line with handing over documentation according to
EN 12599;
- how to assess the result of cleaning.
This European Standard is a parallel standard to EN 12097, which specifies requirements for dimension, shape and location for access panels for cleaning and service in ductwork systems.
This European Standard is made as an umbrella standard with informative annexes that can be revised, completed and further added in future revisions of this European Standard for specific system types, and products or applications in the system, such as:
- Air Handling Units (AHU);
- filter;
- humidifiers;
- heat recovery units;
- decentralised air treatment units such as fan-coil units, indu
Lüftung von Gebäuden - Luftleitungen - Sauberkeit von Lüftungsanlagen
Diese Europäische Norm gilt sowohl für neue als auch für bereits vorhandene Lüftungs- und Klimaanlagen und definiert die Kriterien für die Beurteilung der Sauberkeit sowie die Reinigungsverfahren für diese Anlagen; die Überprüfung der Wirksamkeit der Reinigung gilt auch für Produkte, die EN 1505, EN 1506, EN 13053, EN 13180 und EN 13403 entsprechen und in Klima- und Lüftungsanlagen für von Menschen genutzte Räume innerhalb des Anwendungsbereichs des CEN/TC 156 verwendet werden. Diese Europäische Norm gilt nicht für Anlagen für industrielle Verfahren.
Die Sauberkeit von Lüftungsanlagen ist wichtig für das Wohlbefinden und die Gesundheit des Menschen, den Energieverbrauch, die Nutzungsdauer der Anlage sowie für die Sauberkeit von Betriebsabläufen oder Prozessen, die im belüfteten Bereich ausgeführt werden.
Überlegungen bezüglich des Austauschs von Komponenten als Alternative zur Reinigung (z. B. im Falle von flexiblen Luftleitungen und Luftfiltern) wurden ebenfalls einbezogen.
Diese Europäische Norm legt allgemeine Anforderungen und Verfahren fest, die zur Beurteilung und Aufrechterhaltung der Sauberkeit von Luftleitungsanlagen erforderlich sind, darunter:
- Einstufung der Sauberkeitsqualität;
- Vorgehensweise bei der Beurteilung des Reinigungsbedarfs (optisch, Messungen);
- Häufigkeit der Beurteilung (allgemeine Hinweise); Anleitung für Überprüfungen der Anlage nach EN 15239 und EN 15240, sofern zutreffend;
- Wahl des Reinigungsverfahrens – um im Einklang mit der Übergabe-Dokumentation nach EN 12599 zu stehen;
- Vorgehensweise bei der Beurteilung des Ergebnisses der Reinigung.
Diese Europäische Norm ist eine parallele Norm zu EN 12097, in der Anforderungen an die Maße, die Form und die Lage von Zugangsdeckeln für die Reinigung und Wartung von Luftleitungssystemen festgelegt sind.
Diese Europäische Norm ist als Übersichtsnorm mit informativen Anhängen ausgelegt, die überarbeitet, vervollständigt und bei zukünftigen Überarbeitungen dieser Europäischen Norm für spezifische Systemtypen und Produkte oder Anwendungen im System ergänzt werden können, beispielsweise:
- zentrale raumlufttechnische Geräte (zentrale RLT-Geräte);
- Filter;
- Befeuchter;
- Wärmerückgewinnungseinheiten;
- dezentralisierte Luftbehandlungseinheiten wie beispielsweise Gebläsekonvektoren, Induktionsgeräte;
- Luftdurchlässe;
- Küchen-Ablufteinrichtung.
Die Hauptzielgruppen dieser Europäischen Norm sind Verfasser von Festlegungen für Sauberkeitsqualitätsklassen und Reinigungsverfahren, in erster Linie Systemgestalter, die auch das Zugangssystem festlegen, Gebäudeeigentümer, Wartungs- und Instandhaltungsunternehmen, Endverbraucher sowie Beratungs- und Kontrollunternehmen.
Ventilation des bâtiments - Réseaux de conduits - Propreté des systèmes de ventilation
Cette Norme européenne s’applique aux systèmes de ventilation et de conditionnement d'air qu’ils soient
neufs ou anciens et spécifie les critères d’évaluation de la propreté. Les procédures de nettoyage de ces
systèmes, et la validation de l’efficacité du nettoyage s’applique aussi aux produits conformes à l’EN 1505,
l’EN 1506, l’EN 13053, l’EN 13180 et l’EN 13403, utilisés dans les systèmes de conditionnement de l’air et de
ventilation pour l’occupation humaine, définis dans le domaine d’application du CEN/TC 156. Cette Norme
européenne ne s’applique pas aux installations industrielles de process.
La propreté des systèmes de ventilation est considérée comme importante pour le confort et la santé
humaine, la consommation d’énergie, la durée de vie du système et pour la propreté des activités ou des
processus effectués dans la zone de ventilation.
Des considérations relatives au changement de composant comme alternative au nettoyage (par exemple
dans le cas de conduits flexibles et de filtres à air) sont aussi incluses.
Cette Norme européenne spécifie les exigences et les procédures générales nécessaires pour évaluer et
maintenir la propreté de la ventilation en conduit, dont :
- classification de la qualité de propreté ;
- comment évaluer le besoin de nettoyage (inspection visuelle, mesures) ;
- fréquence des évaluations (orientation générale) ; conseil pour les inspections des systèmes
conformément à l’EN 15239, et à l’EN 15240 quand pertinent ;
- sélection de la méthode de nettoyage – s’inscrivant dans le cadre de la documentation pour la réception
conformément à l’EN 12599 ;
⎯ comment évaluer le résultat du nettoyage.
Cette Norme européenne est une norme parallèle à l’EN 12097, qui spécifie les exigences de dimension, de
forme et de localisation des panneaux d'accès pour le nettoyage et les interventions techniques dans les
réseaux de conduits.
Cette Norme européenne est conçue comme une norme générale avec des annexes informatives pouvant
être révisées, complétées et ajoutées dans les futur révisions de cette norme Européenne pour des types de
systèmes spécifiques, et des produits ou applications dans le système tels que :
- centrale de traitement d’air (CTA) ;
- filtre ;
- humidificateurs ;
- unités de récupération de la chaleur ;
- unités de traitement d’air décentralisées telles que des ventilo-convecteurs ;
- bouches d'air ;
- équipement d’extraction pour cuisine.
La présente Norme européenne est destinée principalement aux spécificateurs des classes de propreté et
aux concepteurs de méthodes de nettoyage pour systèmes primaires qui spécifient aussi le système d’accès,
les propriétaires de bâtiments, les entreprises d’entretien, les entreprises de maintenance, les utilisateurs
finaux et les entreprises de conseils et de contrôle.
Prezračevanje stavb - Kanali - Čistoča prezračevalnih sistemov
Ta evropski standard se uporablja za nove in obstoječe sisteme za prezračevanje in klimatizacijo ter določa merila za ocenjevanje čistoče, postopkov čiščenja teh sistemov in potrjevanje učinkovitosti čiščenja in velja tudi za izdelke, ki so skladni s standardi EN 1505, EN 1506, EN 13053, EN 13180 in EN 13403 in se uporabljajo v sistemih za prezračevanje in klimatizacijo za človeško uporabo, opredeljenih v področju uporabe CEN/TC 156. Ta evropski standard se ne uporablja za naprave za industrijske procese.
Čistoča prezračevalnih sistemov velja kot pomembna za udobje in zdravje človeka, porabo energije, življenjsko dobo sistema in čistočo postopkov ali procesov, ki se izvajajo na prezračevanem območju. Vključeni so tudi premisleki o zamenjavi dela kot nadomestilu za čiščenje (npr. pri gibkih kanalih in zračnih filtrih).
Ta evropski standard določa potrebne splošne zahteve in postopke za presojo in vzdrževanje čistoče prezračevalnih kanalov, vključno z:
– razvrstitvijo kakovosti čistoče;
– načinom za oceno potrebe po čiščenju (vizualno, meritve);
– pogostostjo ocen (splošni napotki); napotki za sistemske preglede v skladu s standardom EN 15239 in, kjer je ustrezno, EN 15240;
– izbiro metode čiščenja – da bo v skladu z oddajo dokumentacije iz standarda
EN 12599;
– načinom za oceno rezultatov čiščenja.
Ta evropski standard se uporablja skupaj s standardom EN 12097, ki določa zahteve za dimenzije, obliko in lokacijo plošče za dostop v primeru čiščenja in servisa sistemov kanalov.
Ta evropski standard je krovni standard z informativnimi dodatki, ki jih je mogoče revidirati, dopolniti in dodati v prihodnjih revizijah za specifične vrste sistemov, izdelkov ali naprav v sistemu, kot so:
– prezračevalne enote (AHU);
– filtri;
– vlažilniki;
– enote za vračanje toplote;
– samostojne enote za obdelavo zraka, kot so ventilatorski konvektorji, indu
General Information
- Status
- Withdrawn
- Publication Date
- 25-Oct-2011
- Withdrawal Date
- 22-Sep-2025
- Technical Committee
- CEN/TC 156 - Ventilation for buildings
- Drafting Committee
- CEN/TC 156/WG 3 - Ductwork
- Current Stage
- 9960 - Withdrawal effective - Withdrawal
- Start Date
- 23-Jul-2025
- Completion Date
- 23-Sep-2025
Relations
- Replaced By
EN 15780:2025 - Ventilation for buildings - Ductwork - Cleanliness of ventilation systems - Effective Date
- 21-Jun-2023
Frequently Asked Questions
EN 15780:2011 is a standard published by the European Committee for Standardization (CEN). Its full title is "Ventilation for buildings - Ductwork - Cleanliness of ventilation systems". This standard covers: This European Standard applies to both new and existing ventilation and air conditioning systems and specifies the assessment criteria of cleanliness, cleaning procedures of these systems, and the validation of the effectiveness of cleaning applies also to products, which conform to EN 1505, EN 1506, EN 13053, EN 13180 and EN 13403, used in air conditioning and ventilation systems for human occupancy defined in the scope of CEN/TC 156. This European Standard does not apply to installations for industrial processes. Cleanliness of ventilation systems is considered important for human comfort and health, energy consumption, system service life and for cleanliness of operations or processes carried out in the ventilated area. Considerations for change of component as an alternative for cleaning (e.g. in case of flexible ducts and air filters) are also included. This European Standard specifies general requirements and procedures necessary in assessing and maintaining the cleanliness of ducted ventilation, including: - cleanliness quality classification; - how to assess the need for cleaning (visual, measurements); - assessment frequency (general guidance); guidance of system inspections in accordance with EN 15239, and EN 15240 when relevant; - selection of cleaning method – to be in line with handing over documentation according to EN 12599; - how to assess the result of cleaning. This European Standard is a parallel standard to EN 12097, which specifies requirements for dimension, shape and location for access panels for cleaning and service in ductwork systems. This European Standard is made as an umbrella standard with informative annexes that can be revised, completed and further added in future revisions of this European Standard for specific system types, and products or applications in the system, such as: - Air Handling Units (AHU); - filter; - humidifiers; - heat recovery units; - decentralised air treatment units such as fan-coil units, indu
This European Standard applies to both new and existing ventilation and air conditioning systems and specifies the assessment criteria of cleanliness, cleaning procedures of these systems, and the validation of the effectiveness of cleaning applies also to products, which conform to EN 1505, EN 1506, EN 13053, EN 13180 and EN 13403, used in air conditioning and ventilation systems for human occupancy defined in the scope of CEN/TC 156. This European Standard does not apply to installations for industrial processes. Cleanliness of ventilation systems is considered important for human comfort and health, energy consumption, system service life and for cleanliness of operations or processes carried out in the ventilated area. Considerations for change of component as an alternative for cleaning (e.g. in case of flexible ducts and air filters) are also included. This European Standard specifies general requirements and procedures necessary in assessing and maintaining the cleanliness of ducted ventilation, including: - cleanliness quality classification; - how to assess the need for cleaning (visual, measurements); - assessment frequency (general guidance); guidance of system inspections in accordance with EN 15239, and EN 15240 when relevant; - selection of cleaning method – to be in line with handing over documentation according to EN 12599; - how to assess the result of cleaning. This European Standard is a parallel standard to EN 12097, which specifies requirements for dimension, shape and location for access panels for cleaning and service in ductwork systems. This European Standard is made as an umbrella standard with informative annexes that can be revised, completed and further added in future revisions of this European Standard for specific system types, and products or applications in the system, such as: - Air Handling Units (AHU); - filter; - humidifiers; - heat recovery units; - decentralised air treatment units such as fan-coil units, indu
EN 15780:2011 is classified under the following ICS (International Classification for Standards) categories: 91.140.30 - Ventilation and air-conditioning systems. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 15780:2011 has the following relationships with other standards: It is inter standard links to EN 15780:2025. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase EN 15780:2011 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of CEN standards.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Lüftung von Gebäuden - Luftleitungen - Sauberkeit von LüftungsanlagenVentilation des bâtiments - Réseaux de conduits - Propreté des systèmes de ventilationVentilation for buildings - Ductwork - Cleanliness of ventilation systems91.140.30VLVWHPLVentilation and air-conditioning91.060.40Dimniki, jaški, kanaliChimneys, shafts, ductsICS:Ta slovenski standard je istoveten z:EN 15780:2011SIST EN 15780:2012en,fr,de01-februar-2012SIST EN 15780:2012SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 15780
October 2011 ICS 91.140.30 English Version
Ventilation for buildings - Ductwork - Cleanliness of ventilation systems
Ventilation des bâtiments - Réseaux de conduits -Propreté des systèmes de ventilation
Lüftung von Gebäuden - Luftleitungen - Sauberkeit von Lüftungsanlagen This European Standard was approved by CEN on 11 September 2011.
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. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.
This European Standard exists 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 15780:2011: ESIST EN 15780:2012
Cleanliness quality classes . 14A.1General . 14A.2Application in general. 14A.3Assessment frequency recommendation. 14A.4Cleanliness class quality measurements . 15A.5Unacceptable fouling – Extract . 15A.6Acceptable dust accumulation level (new ductwork) . 16A.7Acceptable post-clean level . 16Annex B (informative)
Example of cleaning plan . 17Annex C (informative)
Air Handling Units – specific guidance . 20C.1General . 20C.2Recommendations for all cleanliness quality classes . 20C.2.1Casing, including accessibility/access doors . 20C.2.2Filters. 21C.2.3Humidifiers . 21C.2.4Coils. 21C.2.5Sound attenuators . 21C.2.6Fan position and cleaning, including fan motors . 21C.2.7Drainage and prevention of condensation . 21C.3Units for advanced cleanliness quality class . 21C.4Inspection aspects . 22Annex D (informative)
Filters – Specific guidance . 23Annex E (informative)
Humidifiers – Specific guidance . 24SIST EN 15780:2012
Ductwork – Specific installation guidance . 25F.1Acceptable dust accumulation (new ductwork) . 25F.2Protection, Delivery and Installation (PDI) . 25F.3Application of cleanliness levels - airtightness . 27Annex G (informative)
Terminal devices and units – Specific guidance . 28Annex H (informative)
Measurement methods for dust accumulation . 29H.1Evaluation methods of dust accumulation. 29H.1.1General . 29H.1.2Visual inspection . 29H.1.3Methods of verifying deposited solid dust and micro-organisms . 30H.2Summary of methods for evaluation of cleanliness . 31Annex I (informative)
Preferred vacuum test method . 32I.1Test equipment . 32I.2Sampling procedure . 32I.3Analysis procedure . 33Bibliography . 34 SIST EN 15780:2012
1 Scope This European Standard applies to both new and existing ventilation and air conditioning systems and specifies the assessment criteria of cleanliness, cleaning procedures of these systems, and the validation of the effectiveness of cleaning applies also to products, which conform to EN 1505, EN 1506, EN 13053, EN 13180 and EN 13403, used in air conditioning and ventilation systems for human occupancy defined in the scope of CEN/TC 156. This European Standard does not apply to installations for industrial processes. Cleanliness of ventilation systems is considered important for human comfort and health, energy consumption, system service life and for cleanliness of operations or processes carried out in the ventilated area. Considerations for change of component as an alternative for cleaning (e.g. in case of flexible ducts and air filters) are also included. This European Standard specifies general requirements and procedures necessary in assessing and maintaining the cleanliness of ducted ventilation, including: cleanliness quality classification; how to assess the need for cleaning (visual, measurements); assessment frequency (general guidance); guidance of system inspections in accordance with EN 15239, and EN 15240 when relevant; selection of cleaning method – to be in line with handing over documentation according to
EN 12599; how to assess the result of cleaning. This European Standard is a parallel standard to EN 12097, which specifies requirements for dimension, shape and location for access panels for cleaning and service in ductwork systems. This European Standard is made as an umbrella standard with informative annexes that can be revised, completed and further added in future revisions of this European Standard for specific system types, and products or applications in the system, such as: Air Handling Units (AHU); filter; humidifiers; heat recovery units; decentralised air treatment units such as fan-coil units, induction units; terminal devices; kitchen extract equipment. The main target groups of this European Standard are specifiers of the cleanliness quality classes and cleaning methods primarily system designers who also specify the system of access, building owners, services companies, maintenance companies, end users and consultancy and control companies. SIST EN 15780:2012
EN 14799:2007 and the following apply. 3.1 acceptable cleanliness level amount of dust or other impurities not to be exceeded, according to the specified measurement method 3.2 acceptable post-clean level no loose dust is detected visually on the duct surface after cleaning and the system is capable reaching an acceptable cleanliness level according to a defined measurement method NOTE In case of conflict (e.g. between the building owner and the user), or uncertainty objective methods are needed to assess the cleanliness/dirtiness. 3.3 acceptable dust accumulation level (new ductwork) acceptable cleanliness level on new ductwork as handed over from builder to user NOTE In practice this means the quantity of pollution which is deemed acceptable. 3.4 cleanliness state or level of pollution defined as acceptable according to specification and a particular measurement method NOTE Cleanliness is not absolute, it is defined by limit values. Dirtiness is the exceeding of such a defined limit value. 3.5 cleanliness quality class in the scope of this standard there are three levels of cleanliness quality standards to be applied to various buildings and types of system A. Low B. Medium C. High SIST EN 15780:2012
Therefore it is necessary to specify the cleanliness quality class from the beginning and include in the specification both design and installation issues and means to maintain a sufficiently clean ventilation system for its whole lifetime. The design and installation issues shall include (as a minimum): cleanliness quality class; cleanliness criteria and measurement method; production of the system components; delivery to site; site storage; installation; protection of components after installation; handing over the system according to EN 12599 NOTE Annex A presents, as a common classification, three classes of cleanliness, application examples for ductwork, and recommendations for the frequency of regular inspections in accordance with EN 15239. 5.2 Assessment of the need for cleaning Inspection of functionality and cleanliness of ventilation system is a part of proper maintenance of the ventilation systems. Mostly the inspection of the cleanliness may arise from two purposes: to check if ventilation system is dirty and needs to be cleaned (exceeding of a "target level" of cleanliness); to evaluate cleanliness after the cleaning work (to check cleaning work). The assessment methodology is presented in 6.2. For existing buildings, the inspection shall include a study of the existing documentation and recommendations to complete and update the documents. SIST EN 15780:2012
For inspecting and sampling, the ventilation system can be divided in two parts, the ductwork and the rest of the system. Before inspection or sampling, the sites should be selected at random with the aid of the design documents. The sampling sites in the ductwork should be selected from the main duct starting from the AHU, main ducts, and branch ducts. The sampling sites should include straight duct lengths and ducts with changes of direction or terminations. In the rest of the system, filters or humidifiers give usually a good indication of the cleaning needs. NOTE 3 System cleanliness inspections should also make reference to other parts of the as described in 6.2.1, and with particular reference to critical components such as filters and wet areas. 6.2.3 Evaluation methods of dust accumulation Different methods to evaluate cleanliness of ventilation systems are available.
The simplest methods are based on more or less subjective visual observation of the cleanliness of ventilation system combined with use of some special instrumentation. The advanced techniques are able to give relatively accurate results that are comparable to given limit values. NOTE The various methods available are discussed in Annex H. In Annex A preferred measurement methods and limit values are given which relate to various cleanliness quality classes, and to post-clean verification of cleanliness. 6.3 Cleaning plan If, as assessed according to 6.2, cleaning is needed, a cleaning plan shall be provided. The cleaning plan shall include: a summary of the assessment including the list of the systems and parts that need to be cleaned; detailed time schedule of cleaning; cleaning methods to be applied; description of how access will be gained to ducts and equipment not visible in the rooms (ducts, air handling units); list of components to be removed for cleaning, and components to be replaced (when relevant); protection of the rooms in which the cleaning equipment is used; SIST EN 15780:2012
Cleanliness quality classes A.1 General This annex gives a summary of three cleanliness quality classes. It is a key issue to pay attention to cleanliness in design of systems and especially in component selection and specification. It may be modified to take better into account some existing national guidance such as FiSIAQ guideline and VDI 6022. Application examples are presented in A.2, and more specific applications in Annexes C and D. The following four major contaminants from all components may deteriorate IAQ and should be limited: residues of lubricant oils from duct manufacture; dust accumulated during manufacture and installation or debris from construction; dust accumulated during operation; deposited micro-organisms, particularly when toxigenic species are present and conditions are favourable for their survival and growth during storage, installation and operation. A.2 Application in general These levels of cleanliness quality class should be generally applied as follows: Table A.1 — Typical applications of cleanliness quality classes Quality Class Typical examplesLow rooms with only intermittent occupancy e.g. storage rooms, technical rooms
Medium offices, hotels, restaurants, schools, theatres, residential homes, shopping areas, exhibition buildings, sport buildings, general areas in hospitals and general working areas in industries
High
Laboratories, treatment areas in hospitals high quality offices A.3 Assessment frequency recommendation Assessment frequency described on Table A.2 should be considered as the minimum recommendations and the necessity of increasing them will depend on the environment conditions, on the activity and on mechanical and human conditions in both building and its surroundings. SIST EN 15780:2012
AHU Filtersa HumidifiersDucts TerminalsLow 24 12 12 48 48 Medium 12 12 6
24 24 High 12 6 6
12 12 Air handling units equipped with humidification or adiabatic cooling systems, or located in mild and wet weather conditions should be assessed at least twice a year, whatever the use of the building. a Filters should be inspected and maintained according to the manufacturer’s recommendations, with these intervals as the minimum ones.
A.4 Cleanliness class quality measurements The preferred measurement method is derived from the Finnish vacuum te
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