1. Detailed Meanings of EN 12941 & EN 12942
These are two distinct but related European standards for powered air-purifying respirators (PAPRs), differentiated primarily by the type of breathing interface.
- EN 12941: The full title is “Respiratory protective devices – Powered filtering devices incorporating a helmet or a hood – Requirements, testing, marking”. This standard specifies the minimum requirements for loose-fitting respiratory interfaces. It applies to powered filtering devices that use a helmet or a hood, which does not form a tight seal on the user’s face. The air is blown into the hood, creating a positive pressure that prevents contaminants from entering . It is a key standard for devices intended for prolonged use or in highly contaminated environments. The standard does not cover equipment designed for use in oxygen-deficient atmospheres or for escape purposes.
- EN 12942: The full title is “Respiratory protective devices – Powered filtering devices incorporating a tight-fitting respiratory interface – Requirements, testing, marking” . This standard specifies the minimum requirements for powered respiratory protective devices (RPD) that incorporate a tight-fitting respiratory interface, such as a full face mask, half mask, or quarter mask . Unlike hoods, these interfaces form a seal against the face, and the device maintains positive pressure inside the mask.
Both standards are part of a suite of European norms that govern different types of respiratory protective equipment (RPE), such as EN 149 for filtering facepieces and EN 136 for full face masks .
2. Applicable Products of EN 12941 & EN 12942
The applicable products are defined by the type of interface, which dictates the standard under which they are certified.
- Products under EN 12941: This standard applies to all powered air-purifying respirators (PAPRs) that use a loose-fitting helmet or hood as the primary interface . These systems include a battery-powered blower unit that draws air through attached filters (which can be for particles, gases, or a combination) and delivers the purified air into the hood or helmet . They are designed to protect against particulates, gases, and vapours .
- Products under EN 12942: This standard applies to powered air-purifying respirators (PAPRs) that use a tight-fitting mask as the interface. This includes devices that incorporate full face masks, half masks, or quarter masks . Like EN 12941 systems, they consist of a powered blower unit connected to filters, but the clean air is delivered directly into a sealed mask.
3. Testing Methods of EN 12941 & EN 12942
The standards outline comprehensive laboratory and practical performance tests to ensure the devices work as an integrated system. Key tests for EN 12941 (and similarly relevant to EN 12942 systems include :
- Filtration Efficiency Test: Evaluates the device’s ability to filter out particles of specific sizes. For example, it may require a filtration efficiency of over 99% for 0.3-micron particles . The 2022 revision introduced stricter requirements for testing against nanoparticles.
- Airflow Stability Test: Ensures the airflow delivered by the blower remains stable (fluctuations typically within ±10%) throughout its rated operating time.
- Battery Endurance Test: Verifies that the device operates for at least 90% of its claimed runtime on a full battery charge.
- Mechanical Strength Tests: Includes drop and vibration tests to ensure the device remains functional after mechanical stress expected in harsh work environments.
- Alarm Function Verification: Confirms that visual and/or audible alarms activate to warn the user of low battery or airflow failure.
A critical principle, especially emphasized for EN 12941, is full-system testing. The standard certifies the entire assembly (blower, battery, hose, filter, and hood/helmet) as it is used in the field, not just individual components .
4. Important Notes on EN 12941 & EN 12942
- Regulatory Compliance (CE Marking): Compliance with these standards is central to obtaining the CE mark under the PPE Regulation (EU) 2016/425. Respiratory protective devices are classified as Category III (high-risk) PPE, requiring an EU Notified Body to conduct a full quality assurance assessment, including review of technical documentation and product testing.
- Correct Selection and Use: Devices certified to these standards are not suitable for use in oxygen-deficient atmospheres (where oxygen content is typically below 17% by volume) 3. Selection must be based on a thorough risk assessment of the work environment, considering the types and concentrations of contaminants present.
- Protection Levels (EN 12941): Devices under EN 12941 are assigned one of three protection levels (e.g., TH1, TH2, TH3), which indicate the minimum required inward leakage and other performance factors, helping users select the appropriate device for the hazard level .
- Maintenance and Filter Life: Regular maintenance and timely replacement of filters are essential for continued protection 1. Some newer revisions of the standard require products to have a usage time recording function .
- Certification Process: The certification process for these standards is rigorous. It involves submitting technical documentation, sample testing by a Notified Body, and an audit of the manufacturer’s quality system. The entire process can take 6 to 8 months .
5. All Other Content Related to EN 12941 & EN 12942
- Standard Versions and History: EN 12941 was first published in 1998 . The latest version at the time of writing is EN 12941:2023 2. Similarly, EN 12942:2023 is the current version . These updates incorporate the latest scientific and technical developments.
- Part of a Broader Ecosystem: These standards exist within a framework of European RPE standards, including EN 14387 for gas filters and EN 529 for the selection, use, and maintenance of RPE . Understanding the entire system is crucial for proper application.
- Global Context: While these are European standards, the test methods and performance specifications often align with or are similar to those in other regions, though markings and classifications differ (e.g., NIOSH standards in the US) .
- Purpose: The ultimate goal of these standards is to ensure that powered filtering devices provide a reliable and specified level of protection, thereby contributing to workplace health and safety under the EU’s PPE regulatory framework.
