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Why Full-System Testing Under EN 12941 Matters

Picture of Hollie Follett By  Hollie Follett  ·  2 minute read
When it comes to Powered Air-Purifying Respirators (PAPRs), compliance with EN 12941 is essential for ensuring wearer safety in environments with hazardous particulates. But what many specifiers and users overlook is that a PAPR system is classified only when the “complete device” is tested – it is the results of this testing of the complete device that determines compliance.

Variable Airflow?

Under EN 12941:2023 (and the withdrawn EN 12941:1998 + A2:2008), which governs powered filtering devices incorporating a loose fitting respiratory interface (including but not limited to a hood, blouse or suit), the standards make it clear: If a means is provided to adjust the air supply to give a RPD classification then it shall not be possible to change the classification during use. The RPD shall be so designed that it is not possible to inadvertently change the air flow.

This means that for each airflow setting:

  • The complete system (blower, hose, headtop, and filter) must be evaluated.
  • The inward leakage, filter performance, noise level in the headtop, alarm systems, and low-flow conditions must all meet the standard’s criteria at that specific flow rate.
  • Testing must be repeated for each type of compatible filter that the manufacturer claims can be used with the device.

Why? Because lower airflow rates may reduce protection, and filters may perform differently depending on the flow rate passing through them. EN 12941 ensures that the system performs safely and consistently across all possible configurations.

Higher flow rates are also likely to lead to higher noise levels in the head top, which is why noise levels must also meet the requirements of EN 12941 at every flow rate. Higher noise levels can lead to wearer fatigue, inhibit communication with colleagues, and interfere with electronic communication systems.

Implications for Buyers and Specifiers

If you’re evaluating PAPR systems with adjustable airflow, be sure to ask:

  • Is each airflow setting certified to EN 12941?
  • Have all supported filter types been tested across all flow rates?
  • Can the manufacturer provide an original CE certificate from a Notified Body, test data or a Declaration of Conformity confirming this?

If the answer to any of these is unclear or negative, the system may not be fully compliant – and could put users at risk.

Conclusion

EN 12941 doesn’t just certify the blower unit or the filters individually, it certifies the entire system as it is used in the field. When variable airflow is offered, it’s not just a convenience feature – it introduces additional testing requirements that must be fully met. Always verify that your chosen PAPR solution has been tested and classified at every setting, with every filter, to guarantee compliance and, more importantly, user safety.