Annex 15 and the Case for UVZone Shoe Sanitizing Stations

The conversation around cleanroom contamination control has evolved

While EU GMP Annex 1 elevated expectations for holistic Contamination Control Strategies, the emerging revision focus of EU GMP Annex 15 sharpens something equally critical: demonstrable, validated, and reproducible cleaning processes.

That shift has implications for areas many facilities historically treated as routine.

Including footwear.

Annex 15: From "Cleaning Activity" to Validated Process

Annex 15 reinforces that cleaning must be:

• Scientifically justified
• Risk assessed
• Reproducible
• Measurable
• Supported by data

This extends beyond product contact surfaces. It includes any process step that mitigates contamination risk in classified environments.

Footwear decontamination at gowning and other transitions is, functionally, a cleaning and contamination control intervention. Under Annex 15 scrutiny, the question becomes:

Is it validated?

Traditional approaches such as chemical mats, wipes, or manual spray applications can be difficult to standardize and document. Variability in contact time, saturation levels, operator technique, and residue management complicates validation and requalification efforts.

In an Annex 15 framework, variability is vulnerability.

Footwear as a Quantifiable Risk Vector

Published literature shows that shoes can carry 10,000 to 1 million CFU per cm², including spore-formers and healthcare-associated pathogens. In high-grade zones, that load represents a measurable contamination pathway.

Annex 15 expects cleaning processes to demonstrate effectiveness with defined acceptance criteria. A footwear intervention must therefore be:

• Rapid
• Repeatable
• Loggable
• Scientifically defensible

UVZone Shoe Sanitizing Stations: A Validation-Friendly Approach

UVZone® shoe sanitizing stations utilize a combination of:

• UV-C energy for nucleic acid disruption
• Ozone for gas-phase penetration into tread geometry

Independent third-party testing at NSF, CREM Co, and Microchem labs has demonstrated 3 to 5 log microbial reductions within 6 to 10 seconds under controlled conditions. The key Annex 15 advantage is not simply efficacy. It is reproducibility.

Each UVZone cycle is:

• Fixed in duration
• Automated
• Operator-independent
• Documentable

This converts a historically manual cleaning task into a defined, repeatable process step that can be qualified and revalidated.

Annex 15 Advantages

1. Reproducibility

Automated cycles remove variability associated with manual wet disinfection.

2. Data Integration

Systems capable of generating cycle records can support cleaning validation files and correlate with environmental monitoring trends.

3. Reduced Chemical Burden

Unlike chemical alternatives, UV and ozone are generated on demand and leave no traces such as residues or liquid carryover post-cycle–concerns that complicate cleaning validation documentation.

4. Qualification Alignment

Installation Qualification, Operational Qualification, and Performance Qualification protocols can be structured around measurable pre/post bioburden reductions, directly supporting Annex 15 documentation requirements.

5. Risk Management Justification

In CCS risk assessments, automated footwear sanitation can be justified as a preventive control measure reducing baseline bioburden entering Grade B and C areas.

Practical Implementation Under Annex 15

For facilities considering integration:

• Install at defined gowning or classification transition points
• Perform initial swab validation studies tied to cleaning acceptance limits
• Establish requalification intervals aligned with cleaning validation strategy
• Document ozone dissipation levels to confirm occupational safety compliance
• Integrate results into ongoing EM trending

When framed correctly, this becomes not an accessory device, but a validated contamination control step.

A Strategic Shift

Annex 15 is moving the industry toward disciplined, evidence-based cleaning validation. Every contamination mitigation activity must withstand scientific and inspection scrutiny.

Footwear sanitation is no longer a procedural afterthought.

When automated, validated, and data-supported, it becomes part of the facility's defensible cleaning validation architecture. In a regulatory environment that rewards reproducibility and penalizes variability, that distinction matters.