CEN - European Committee for Standardization

This document specifies the procedures to be followed when connecting cylinder valves to gas cylinders. It specifically applies to all valve and cylinder combinations connected with ISO screw threads as specified in ISO 11363-1 and ISO 15245-1. It defines procedures and practices for inspection and preparation prior to valving for both taper and parallel screw threads.
Torque values are given in Annex A for steel and aluminium alloy gas cylinders including composite cylinders with steel or aluminium alloy neck boss.
NOTE            The procedures and practices specified in this document can be beneficially applied to other valve to cylinder screw thread connection systems. ISO/TR 11364 lists the valve to gas cylinder threads in use worldwide. It gives details of the thread identification codes, whether the threads are interchangeable with ISO threads and if the taping procedure and torque values specified in this document can be used. ISO/TR 11364 gives clear guidance for the method and torque for all listed inlet threads, which are not interchangeable.

This document specifies computational methods for determining the acoustical source level of projectile sound and its one-third octave band spectrum, expressed as the sound exposure level for nominal mid-band frequencies from 12,5 Hz to 10 kHz. It also specifies a method on how to use this source level to calculate the sound exposure level at a receiver position.
Results obtained with this document can be used as a basis for assessment of projectile sound from shooting ranges. Additionally, the data can be used to determine sound emission or immission from different types of ammunition and weapons. The prediction methods are applicable to outdoor conditions and straight projectile trajectories. Two computational methods are given to determine the acoustical source level: one for streamlined projectile shapes and one for non-streamlined shapes, such as pellets.

This document specifies a method for the enumeration of intestinal enterococci in water, including Enterococcus faecalis, Enterococcus faecium, Enterococcus durans, Enterococcus avium, Enterococcus gallinarum, Enterococcus hirae, Enterococcus casselifavus. The method is based on the growth of target organisms in a liquid medium and calculation of the “most probable number” (MPN) of microorganisms by reference to MPN tables or using suitable MPN informatic programs.
This method can be applied to drinking water and bathing water (fresh or marine), together with other similar water types including those containing an appreciable amount of suspended matter, and allows the detection of enterococci at 1 colony-forming unit (CFU) per 100 ml with definitive results within (26 ± 2) h in the presence of heterotrophic bacteria in numbers as high as 1 × 106 per 100 ml of sample.
For bathing waters, fresh and marine, enterococci are best enumerated when samples are diluted 1:10.
The test specified in this document relies upon the detection of intestinal enterococci based upon expression of the enzyme ß-D-glucosidase and provides a confirmed result in 24 h without further testing of positive wells.
This document does not apply to bottled waters, for which the method has not been validated and therefore is outside the scope of this document, unless appropriate validation of performance of this method has been undertaken by the laboratory prior to use.

The scope of this document is constrained to the content of the electronic prescription (ePrescription) itself, the digital document which is issued by a prescribing healthcare professional and received by a dispensing healthcare professional. The prescribed medicinal product is to be dispensed through an authorized healthcare professional with the aim of being administered to a human patient. The ePrescription in the administrative workflow of reimbursement is not covered in this document.
This document specifies the requirements that apply to ePrescriptions. It describes generic principles that are considered important for all ePrescriptions.
This document is applicable to ePrescriptions of medicinal products for human use. Although other kinds of products (e.g. medical devices, wound care products) can be ordered by means of an ePrescription, the requirements in this document are aimed at medicinal products that have a market authorization and at pharmaceutical preparations which are compounded in a pharmacy.
This document does not limit the scope to any setting (community, institutional) and leaves it to the national bodies to decide on this matter.
This document specifies a list of data elements that can be considered as essential for ePrescriptions, depending on jurisdiction or clinical setting (primary healthcare, hospital, etc.). Ensuring the authenticity of these data elements is in scope and will have impact on the requirements of information systems.
Other messages, roles and scenarios (e.g. validation of a prescription, administration, medication charts, EHR of the patient, reimbursement of care and dispensed products) are not covered in this document, because they are country-specific or region-specific, due to differences in culture and in legislation of healthcare. However, requirements and content of ePrescriptions within the context of jurisdictions have a relationship with these scenarios. This document also does not cover the way in which ePrescriptions are made available or exchanged, and the process of prescribing itself.
The logistic process of prescribing itself is not part of the scope. A prescription can either be sent (pushed) to a dispenser or either be retrieved (pulled) at the dispenser. However, the requirement for the prescription is described, that it will be able to function in both environments.

This International Standard specifies a method for the determination of the genotoxic potential of water and waste water using the bacterial strains Salmonella enterica subsp. enterica serotype Typhimurium TA 98 and
TA 100 in a fluctuation assay. This combination of strains is able to measure the genotoxicity of chemicals that  induce point mutations (base pair substitutions and frameshift mutations) in genes coding for enzymes that are   involved in the biosynthesis of the amino acid, histidine.

This document specifies a test method for determining the transverse flexibility (troughability) of a conveyor belt, expressed as a ratio, F/L. The method is not suitable or valid for light conveyor belts as described in ISO 21183-1.
NOTE            The transverse “flexibility” determined by the method described in this document is only indirectly associated with the inverse of flexural modulus as specified in ISO 178. Nor does it take into consideration the differences in “flexibility” as exhibited by three-point and four-point bending, which takes account of the flexural strain and the thickness of the test piece.

This document provides a reference list of functions that may be present in an Electronic Health Record System (EHR-S). The function list is described from a user perspective with the intent to enable consistent expression of system functionality. This EHR-S Functional Model, through the creation of Functional Profiles for care settings and realms, enables a standardized description and common understanding of functions sought or available in a given setting (e.g. intensive care, cardiology, office practice in one country or primary care in another country).

This document specifies a method for the direct exposure of plastics to solar radiation (method A) and a method for the exposure of plastics to glass-filtered solar radiation (exposure behind window glass) (method B). The purpose is to assess property changes produced after specified stages of such exposures.
General guidance concerning the scope of the ISO 877 series[1] is given in ISO 877-1.

This document is applicable to two-way or multi-way ball valves manufactured with all types of polypropylene (PP) and chlorinated polyvinylchloride (PVC-C) thermoplastic materials to be used for the transport of pressurized water whether or not intended for human consumption (domestic systems) for applications in buildings and utility branches.
NOTE 1        The two-way valve is generally used for sectioning and control of flows, and the multi-way valve is used to divert or mix the flows. For information on their functionality, see ISO 16135:2006, Annex B.
NOTE 2        The reader of this document is informed that the water intended for human consumption is subjected to national, regional or local regulatory provisions as applicable.
The application classes are indicated in ISO 15874 and ISO 15877 series.
This document specifies valve characteristics as follows:
—     dimensions for assembly in the relevant pipelines,
—     physical and mechanical requirements.
Other materials can fit the scope of this document if the application classes are specified in a material related specific standard.
Ball valves specified in this document are not intended to be used in conjunction with pipes made by metallic material and copper alloys.

This document applies to arc stud welding of metallic materials subject to static and fatigue loading. This document specifies requirements that are particular to stud welding, in relation to welding knowledge, quality requirements, welding procedure specification, welding procedure qualification, qualification testing of operators and testing of production welds.
This document is applicable where it is necessary to demonstrate the capability of a manufacturer to produce welded construction of a specified quality.
NOTE            General quality requirements for fusion welding of metallic materials are given in ISO 3834-1, ISO 3834-2, ISO 3834-3, ISO 3834-4 and ISO 3834-5.
This document has been prepared in a comprehensive manner, with a view to it being used as a reference in contracts. The requirements contained within it can be adopted in full, or partially, if certain requirements are not relevant to a particular construction (see Annex A). For the working range of stud welding, see Annex B.

This document describes steps, conditions and protocols for safe maintenance and repair to facilitate remanufacturing, re-use and preparation for repurposing of battery systems, battery packs and battery modules designed for EV applications for alkali-ion (Li-ion, Na-ion), Pb, NiMH and combined chemistries.
This document also includes an informative guidance on design and assembly techniques that facilitate the maintenance, repair, re-use and preparation for repurposing of EV battery systems, battery packs and battery modules (Annex B).
NOTE   Individual cell is replaced when it is allowed and described by the EV battery systems, battery packs and battery modules manufacturer. In this case, battery modules manufacturer provides the necessary instructions for cell replacement.

This document specifies requirements and their test methods for sinus membrane elevators used during the placement of dental implants for sinus floor lifting. It also specifies the requirements for their marking and labelling.

This document specifies a method for determining the colour fastness to sea water of leather of all kinds at all stages of processing.

This document describes a classification of non-metallic blast-cleaning abrasives for the preparation of steel substrates before application of paints and related products.
It specifies the characteristics which are required for the complete designation of such abrasives.
This document applies to abrasives supplied in the new or unused condition only. It does not apply to abrasives either during or after use.
NOTE       Although this document has been developed specifically to meet requirements for preparation of steelwork, the properties specified will generally be appropriate for use when preparing other material surfaces, or components, using blast-cleaning techniques. These techniques are described in ISO 8504-2.

This document specifies a method for the determination of the flat crush resistance of corrugated fibreboard used in the manufacture of shipping containers.
This document is applicable to single-faced and single-wall (double-faced) corrugated fibreboard.
This document is not applicable to double-wall (double-double-faced) corrugated fibreboard and to microflute corrugated fibreboard, since the end-point of the test is not clearly defined or observable.

This document specifies test methods for the determination of the percentage of defective particles and of the microstructure of metallic blast-cleaning abrasives.

This document specifies an analysing methodology for protecting potable water in potable water installations within and outside buildings but within premises from the risk of pollution by backflow of non-potable water and gives recommendations on the design, risk analysis, backflow prevention devices and their installation methods (see Figure 1 and Figure 2).
This methodology is also intended to be used outside premises for all water systems connected to a potable water distribution system up to and including the point of use (see Figure 3).
The product standards for the specific backflow prevention devices or arrangements are intended to be used in conjunction with this document. For the development of new devices or systems, this document is intended to be used as a reference to establish the necessary level of backflow protection.

This document specifies requirements for fire activated oxygen shut-off devices that stop the flow of oxygen in respiratory therapy tubing when activated by fire.
NOTE 1        Typical arrangements for fire activated oxygen shut-off devices are shown in Annex C.
NOTE 2        Respiratory therapy tubing is covered by ISO 17256.
NOTE 3        Use of fire activated oxygen shut-off devices in medical devices or accessories is not mandated in this document.
The fire activated oxygen shut-off devices specified in this document are not suitable for use with oxygen therapy systems with flows in excess of 20 l/min).
NOTE 4        There is rationale for this clause in A.2.
The requirements in this device-specific standard take precedence over any conflicting requirements in the general standard for airway devices (ISO 18190). All the common requirements that appear in the general standard for airway devices have been removed from this document.

This document provides information on the processes and technologies for inorganic substance and nutrient recovery from sludge.
This document is applicable to sludge and products from urban wastewater collection systems, night soil, wastewater treatment plants for urban and similar industrial waters. It includes all sludge that can have either similar environmental or health impacts, or both.
Hazardous sludge from industry and dredged sludge are excluded from this document.

This document provides characteristics and typical values for acrylonitrile-butadiene-styrene (ABS) recyclates intended for groups of defined applications (the product families).
The characteristics and typical values for the different product families are derived from the performance requirements of the products belonging to that family, including requirements for product manufacturing processes where applicable.
This document applies to plastic recyclates intended to be used for the manufacturing of (intermediate) products.
This document is intended to be used in conjunction with part 1 of this standard series, which describes the designation system for plastic recyclates. The designation system allows comparison between recycled and virgin material at the level of the polymer’s defined designatory properties.
NOTE 1   Examples of designations of plastic recyclates are given in Annex A.
NOTE 2   The selection of properties for a product family is based on EN ISO 10350 1, extended with specific properties related to plastic recyclates.

This document provides characteristics and typical values for poly(ethylene terephthalate) (PET) recyclates intended for groups of defined applications (the product families).
The characteristics and typical values for the different product families are derived from the performance requirements of the products belonging to that family, including requirements for product manufacturing processes where applicable.
This document applies to plastic recyclates intended to be used for the manufacturing of (intermediate) products.
This document is intended to be used in conjunction with part 1 of this standard series, which describes the designation system for plastic recyclates. The designation system allows comparison between recycled and virgin material at the level of the polymer's defined designatory properties.
NOTE 1   Examples of designations of plastic recyclates are given in the Annex A.
NOTE 2   The selection of properties for a product family is based on EN ISO 10350 1, extended with specific properties related to plastic recyclates.

This document specifies methods for determining the fastness of the surface of leather to hydroalcoholic mixtures.
It is applicable to all kinds of leather.

This document provides characteristics and typical values for polyethylene (PE) recyclates intended for groups of defined applications (the product families).
The characteristics and typical values for the different product families are derived from the performance requirements of the products belonging to that family, including requirements for product manufacturing processes where applicable.
This document applies to plastic recyclates intended to be used for the manufacturing of (intermediate) products.
This document is intended to be used in conjunction with part 1 of this standard series, which describes the designation system for plastic recyclates. The designation system allows comparison between recycled and virgin material at the level of the polymer's defined designatory properties.
NOTE 1   Examples of designations of plastic recyclates are given in Annex A.
NOTE 2   The selection of properties for a product family is based on EN ISO 10350 1, extended with specific properties related to plastic recyclates.

This document provides a robust understanding of existing performance measures in facility management (FM) organizations and the needs of both:
—     the demand organization;
—     the FM organization across the breadth of public and private sector organizations, profit and not for profit.

This document provides characteristics and typical values for polystyrene (PS) recyclates intended for groups of defined applications (the product families).
The characteristics and typical values for the different product families are derived from the performance requirements of the products belonging to that family, including requirements for product manufacturing processes where applicable.
This document applies to plastic recyclates intended to be used for the manufacturing of (intermediate) products.
This document is intended to be used in conjunction with part 1 of this standard series, which describes the designation system for plastic recyclates. The designation system allows comparison between recycled and virgin material at the level of the polymer’s defined designatory properties.
NOTE 1   Examples of designations of plastic recyclates are given in Annex A.
NOTE 2   The selection of relevant properties for a product family is based on EN ISO 10350 1, extended with specific properties related to plastic recyclates.

This document specifies recommendations for the design of polymeric products used in road vehicles to facilitate separation and recycling after shredding.
This document is not applicable to dismantling of road vehicles and removal of parts and components.
This document is not applicable to elastomers.

This document specifies a test method for comparing the compression shear strength of adhesive bonds in wood and solid wood after exposure to a target temperature for a specified duration of time.
This document is applicable to adhesives used in load bearing timber structures.
This document is not applicable to Epoxy- and two component Polyurethane-adhesives.
This method is intended to obtain data for the performance of wood adhesives at very high temperatures. The result of this comparison can be used to classify the adhesive with regard to the behaviour of load-bearing timber structures in fire.

Identical scope from ISO 22359:2024

This document reviews the structural changes that have been precipitated by the COVID-19 pandemic in Remote Connected Care and Mobile Health (RCC-MH). The impact of the COVID-19 pandemic on care settings such as home and community care, acute care and outpatient care are reviewed discussing how well these healthcare environments were prepared to address the encountered connectivity challenges from a standards point of view. The current standards landscape is reviewed and gaps are identified leading to recommendations for future standards work.

This document provides characteristics and typical values for polypropylene (PP) recyclates intended for groups of defined applications (the product families).
The characteristics and typical values for the different product families are derived from the performance requirements of the products belonging to that family, including requirements for product manufacturing processes where applicable.
This document applies to plastic recyclates intended to be used for the manufacturing of (intermediate) products.
This document is intended to be used in conjunction with part 1 of this standard series, which describes the designation system for plastic recyclates. The designation system allows comparison between recycled and virgin material at the level of the polymer’s defined designatory properties.
NOTE 1   Examples of designations of plastic recyclates are given in Annex A.
NOTE 2   The selection of properties for a product family is based on EN ISO 10350 1, extended with specific properties related to plastic recyclates.

This document specifies requirements and test methods for marketed and delivered automotive diesel fuel. It is applicable to automotive diesel fuel for use in diesel engine vehicles designed to run on automotive diesel fuel containing up to 7,0 %(V/V) fatty acid methyl ester (FAME).
NOTE   For the purposes of this document, the terms “% (m/m)” and “% (V/V)” are used to represent respectively the mass fraction and the volume fraction.

This document is the general part of the series that describes the designation system for plastic recyclates.
This document is dealing with recyclates after the recycling operation and prior to converting and compounding (when applicable). It is dealing with preparation of samples and determination of properties.
NOTE 1   This document supports the underlaying standards of this series that, per polymer type, provide an overview of the relevant characteristics and typical values for recyclates for use in certain application groups (product families) in combination with the relevant converting technologies.
NOTE 2   The overview of the relevant properties is based on and further extends the relevant properties given in EN ISO 10350 1.

This document provides characteristics and typical values for poly(vinyl chloride) (PVC) recyclates intended for groups of defined applications (the product families).
The characteristics and typical values for the different product families are derived from the performance requirements of the products belonging to that family, including requirements for product manufacturing processes where applicable.
This document applies to plastic recyclates intended to be used for the manufacturing of (intermediate) products.
This document is intended to be used in conjunction with part 1 of this standard series, which describes the designation system for plastic recyclates. The designation system allows comparison between recycled and virgin material at the level of the polymer’s defined designatory properties.
NOTE 1   Examples of designations of plastic recyclates are given in Annex A.
NOTE 2   The selection of properties for a product family is based on EN ISO 10350 1, extended with specific properties related to plastic recyclates.

This document applies to hot rolled and cold rolled non-coated steel flat products made of multiphase steels for cold forming. It covers cold rolled products of thicknesses t < 3 mm and hot rolled products of thicknesses t ≤ 6,5 mm.
These products are delivered in sheet, hot rolled strip, slit hot rolled strip, cold strip, slit cold rolled strip or cut lengths obtained from slit wide strip.
Flat products of multiphase steels for cold forming can be delivered with an electrolytic zinc coating according to EN 10152.

This document explains the requirements and test methods for paraffinic diesel fuel from synthesis or hydrotreatment. Synthesis refers to XTL processes where X refers to various feedstocks for example Gas (G), Biomass (B) or Coal (C) and TL stands for To-Liquid. Hydrotreatment of vegetable oils and animal fats yield Hydrotreated Vegetable Oil (HVO). Paraffinic diesel fuel can be blended with up to 7,0 % (V/V) fatty acid methyl ester (FAME). This document provides background information to the final text of EN 15940 [1] and gives guidance and explanations to the producers, blenders, marketers and users of paraffinic automotive diesel fuel.
Paraffinic diesel fuel is a high quality, clean burning fuel with virtually no sulfur and aromatics. Paraffinic diesel fuel can be used in diesel engines, also to reduce regulated emissions. In order to have the greatest possible emissions reduction, a specific calibration is needed. Some types of paraffinic diesel fuel, at present notably HVO, can also offer a meaningful contribution to the target of increased non-crude derived and/or renewable content in the transportation fuel pool.
For general diesel engine operation, durability and warranty, paraffinic automotive diesel fuel needs a validation step to confirm the compatibility of the fuel with the vehicle, which for some existing engines still needs to be done. The vehicle manufacturer needs to be consulted before use.
NOTE 1   This document is directly related to EN 15940 and will be updated once further publications take place.
NOTE 2   Paraffinic diesel fuel is also used as a blending component in automotive diesel fuel. In that case, composition and properties of the final blends are defined by relevant fuel specification standards.
NOTE 3   For the purposes of this document, the terms "% (m/m)" and "% (V/V)" are used to represent respectively the mass fraction and the volume fraction.

This document defines the General Feature Model (GFM) as the metamodel for creating application schemas in the context of geo-information modelling. The GFM is explained and implemented as rules for creating and documenting application schemas, including principles for the definition of features.
This document is applicable to:
—     conceptual modelling of features and their properties from a universe of discourse;
—     definition of application schemas;
—     general rules for using a conceptual schema language for application schemas;
—     rules for application schemas using UML as the conceptual schema language;
—     transition from the concepts in the conceptual model to the data types in the application schema;
—     integration of standardized schemas from other ISO geographic information standards with the application schema.
This document does not apply to:
—     choice of one particular conceptual schema language for application schemas;
—     definition of any particular application schemas;
—     representation of feature types and their properties in a feature catalogue;
—     representation of metadata;
—     rules for mapping one application schema to another;
—     implementation of the application schema in a computer environment;
—     computer system and application software design;
—     programming.

This document:
a)       builds on the models established in ISO 19152-1 and ISO 19152-2 to cover the valuation aspect of the Land Administration Domain Model (LADM);
b)       provides an abstract conceptual model covering:
1)       values (assessed values, valuation procedures, mass valuation);
2)       transaction prices;
3)       sales statistics;
4)       valuation units (parcel (legal space parcel), building, condominium unit, valuation unit group).
c)        provides terminology for the valuation component of land administration/georegulation, based on various national and international systems, that is as simple as possible in order to be useful in practice. The terminology allows a shared description of different formal or informal practices and procedures in various jurisdictions;
d)       specifies a content model independent of encoding that can be employed as a basis for local, national and regional profiles for valuation processes; and
e)       enables the combining of valuation information from different sources in a coherent manner.
NOTE            This document does not interfere with national property valuation-related regulations with potential legal implications.

This document specifies the conditions for determination of the axial tensile properties of ceramic matrix composite (CMC) tubes with continuous fibre-reinforcement at elevated temperature in air, vacuum and inert gas atmospheres. The applicability of this document is specific to tubular geometries because fibre architecture and specimen geometry factors in composite tubes are distinctly different from those in flat specimens.
This document provides information on the axial tensile properties and stress-strain response in temperature, such as axial tensile strength, axial tensile strain at failure and elastic constants. The information can be used for material development, control of manufacturing (quality insurance), material comparison, characterization, reliability and design data generation for tubular components.
This document addresses, but is not restricted to, various suggested test piece fabrication methods. This document is primarily applicable to ceramic matrix composite tubes with a continuous fibrous-reinforcement: unidirectional (1D, filament winding and tape lay-up), bi-directional (2D, braid and weave) and multi-directional (xD, with x > 2), tested along the tube axis.

This document specifies a computational method (in line with ISO 17201-4) for estimating the acoustic source data of muzzle blast and explosions on the basis of non-acoustic data for firearms with calibres less than 20 mm and explosions less than 50 g TNT equivalent.
This document addresses those cases where no source measurements exist. This document can also be used as an interpolation method between measurements of muzzle blast.
Source data are given in terms of spectral angular source energy covering the frequency range from 12,5 Hz to 10 kHz and can be used as data input for sound propagation calculation.
This document does not apply to the prediction of sound levels for the assessment of hearing damage; nor can it be used to predict sound pressure levels or sound exposure levels at distances where linear acoustics do not apply.

This document specifies general requirements and gives guidelines for ventilation systems except for industrial, medical and laboratory facilities.
This document also specifies cleanliness criteria and procedures necessary in assessing and maintaining the cleanliness of ventilation systems over their lifetime from design and installation to maintenance.
This document is applicable to both new and existing ventilation systems with, and without, air conditioning and kitchen extract systems.

This document specifies a method for the determination of the compression stress/strain characteristics of low-density flexible cellular materials up to 250 kg/m3. It also specifies a method for the calculation of the compression stress value of such materials.

This document specifies requirements for the safety, strength and durability of all types of non-domestic seating intended to be used by adults with a weight of not more than 110 kg, including office visitor chairs.
This document does not apply to ranked seating, office work chairs, chairs for educational institutions, outdoor seating and to links for linked seating for which other European Standards exist. It does also not apply to work chairs for industrial use.
This document does not include requirements for the durability of upholstery materials, castors, reclining and tilting mechanisms and seat height adjustment mechanisms.
This document does not include requirements for the resistance to ageing, degradation and flammability.
This document does not include requirements for electrical safety.
Annex A (normative) contains test methods for finger entrapment and shear and compression.
Annex B (normative) contains a seat side-to-side durability test at D-G points.
Annex C (normative) contains a test method for Leg rest durability.
Annex D (normative) contains the determination of seat loading point for seating with suspended flexible material.
Annex E (informative) contains additional drop tests.
Annex F (informative) contains information on the level of test severity in relation to applications.
Annex G (informative) contains recommended dimensions for non-domestic chairs.
Annex H (informative) contains a rationale for single column seating.

1.1        This document specifies requirements relating to the construction and operation of devices producing air through the blending of oxygen and nitrogen for use as sources of supply in supply systems for medical gases.
1.2        This document is applicable to proportioning units intended to produce synthetic medical air and air for driving surgical tools by mixing in defined proportions oxygen and nitrogen.
1.3        This document is applicable to proportioning units intended to be components of a medical gas supply system for medical air which supplies a medical gas pipeline distribution system complying with ISO 7396-1.
1.4        The number of proportioning units within the medical air supply system and their combination with other sources of supply (e.g. cylinder manifolds) to ensure that the supply system consists of at least three sources of supply is outside the scope of this document.
Requirements for the supply systems for medical air are given in ISO 7396-1.