The 2022 revision of EU GMP Annex 1 is often summarised as "isolators now, RABS if you must". That is not what it says, and reading it that way produces a URS that misses most of what actually changed. The substantive change is that contamination control is required to be a designed, justified and monitored system — and equipment requirements are one of the places that justification has to appear.
This is a practitioner's reading, not legal or regulatory advice. Confirm every interpretation against the current text and your own quality system.
The contamination control strategy becomes the anchor
Annex 1 requires a documented contamination control strategy covering the process, equipment, facility and personnel, with the effectiveness of the controls monitored. For equipment specification this has a direct consequence: a requirement no longer stands on its own. Each one should be traceable to the element of the strategy it implements.
In practice that means adding a column to the URS. Alongside requirement number, text and verification stage, record which contamination control element the requirement serves — barrier integrity, first air protection, intervention reduction, cleanability, decontamination, monitoring. Requirements with no such link are usually inherited boilerplate; strategy elements with no requirement are usually gaps.
Barrier technology needs a justification, not a preference
The text expresses a clear expectation that barrier technology be considered, and that the choice be justified with respect to the process. So the URS statement is not "an isolator shall be provided". It is the decision plus its rationale, plus the requirements that follow from it:
- Leak-tightness class and the test method that demonstrates it
- Glove management: port positions derived from the intervention list, integrity test frequency and method, change interval
- Decontamination: agent, cycle development approach, biological indicator log reduction, cycle time as unavailable production time
- Transfer systems: rapid transfer ports, e-beam or continuous decontamination tunnels, and the material flow each supports
- Recovery: pressure and particle recovery time after a defined breach
Interventions are designed out, and the list must exist
Annex 1 pushes hard towards eliminating operator intervention in the critical zone, with automation and robotics named as options. Any intervention that remains needs to be pre-defined, justified and reflected in the aseptic process simulation.
That makes the intervention list a URS input rather than an operations detail. Each remaining intervention generates equipment requirements: access without breaching first air, tooling reachable through the installed glove ports, and the ability to perform the action without stopping the line where that is the design intent.
Monitoring becomes a design requirement
Continuous viable and non-viable monitoring of grade A, with sample points selected by risk assessment and a system capable of detecting trends, has to be built into the machine, not attached afterwards. The URS should state:
| Requirement area | What to specify |
|---|---|
| Non-viable particle monitoring | Number and position of sample points, isokinetic probe sizing, sample flow, alarm and action limits, data retention |
| Viable monitoring | Active air sampler positions, settle plate locations, ability to place and retrieve without breaching first air |
| Airflow | Airflow visualisation studies as a design deliverable, at defined machine states including intervention |
| Trending | Export of monitoring data in a form the site's trending system can consume |
Utilities in scope
Water systems, gases and steam that contact product or product-contact surfaces are within the strategy. Gas filtration for compressed gases entering grade A, filter integrity testing of those filters in situ, and sterilising-grade filtration requirements — including pre-use post-sterilisation integrity testing where the risk assessment calls for it — are equipment requirements, not procurement notes.
Practical changes to the document
- Add the contamination control traceability column and populate it.
- Move the intervention list from an appendix to a numbered input, and derive requirements from it.
- Specify decontamination and recovery times as capacity-affecting parameters, not incidental data.
- Make airflow visualisation, glove integrity testing and monitoring point qualification named deliverables with acceptance criteria, so they appear in the supplier's scope and in the qualification plan.
- State the sterilisation and depyrogenation requirements — cycles, load patterns, F0 or log reduction — rather than referring generically to the standard.
The reasonable summary
Annex 1 (2022) did not add a list of forbidden machines. It raised the standard of the argument. A URS that states what is required, why it is required and how it will be shown to work is now the ordinary expectation for sterile equipment — and a specification assembled from a supplier brochure will not carry that argument.