Cleanroom validation is the documented, mandatory process that ensures traceability and the final certification of the installation. This process verifies that the room meets the critical cleanliness, pressure, temperature and filtration requirements set out by ISO 14644, GMP and the FDA.
It is not a simple technical check: validation is a guarantee of quality and safety that ensures the cleanroom can operate within the parameters defined for its ISO class.
In this article we explain how the validation process is carried out, what tests it includes, and why it is essential for obtaining a cleanroom’s final certification.
What it means to validate a cleanroom
Validating a cleanroom means demonstrating, through documented tests, that the environment functions in accordance with the design specifications and applicable standards.
The goal is to guarantee that environmental conditions — “air cleanliness, pressure, temperature and humidity” — remain stable and within established limits.
Validation is mandatory in sectors such as:
- Pharmaceutical and biotechnological.
- Hospital and healthcare.
- Microelectronics and optics.
- Cosmetic and food.
Regulations applicable to validation
The main international standards governing cleanroom validation are:
- ISO 14644-1: classification of air cleanliness according to particle concentration.
- ISO 14644-2: continuous monitoring and performance requirements.
- ISO 14644-3: test methods and performance testing.
- GMP (Good Manufacturing Practices): good manufacturing practices in the pharmaceutical industry.
- FDA 21 CFR Part 210-211: regulations for pharmaceutical manufacturing facilities.
Complying with these standards ensures the installation is safe, traceable and certifiable.
Qualification stages: IQ, OQ and PQ
Validation is carried out in three main phases, covering everything from installation to the room’s daily operation.
1. IQ – Installation Qualification
Verifies that all equipment, systems and components have been correctly installed in accordance with the design and technical specifications.
This includes reviewing:
- Technical documentation (drawings, material certificates, factory test reports).
- Electrical and mechanical connections.
- Correct placement of HEPA filters, sensors, valves and grilles.
- Traceability of components and construction materials.
2. OQ – Operational Qualification
Confirms that systems function according to defined parameters under normal operating conditions.
Tests are carried out on:
- Airflow and velocity.
- Differential pressure between zones.
- Temperature and relative humidity.
- Integrity of HEPA and ULPA filters.
- Alarms and automatic control systems.
3. PQ – Performance Qualification
Evaluates the room’s performance during actual use, with staff and equipment operating.
This includes:
- Particle counts at rest and in operation.
- Microbiological testing.
- Pressure recovery tests.
- Work simulations.
Once these three stages have been passed, the room is considered validated and can receive its official certification.
Key tests: ISO and GMP compliance testing
During the process, specific tests are carried out to verify compliance with ISO and GMP criteria:
| Type of test | Objective | Applicable standard |
|---|---|---|
| Particle count | Determine the ISO cleanliness class. | ISO 14644-1 |
| HEPA filter integrity test | Verify the absence of leaks. | ISO 14644-3 |
| Airflow visualization (smoke) | Check directionality and coverage. | ISO 14644-3 |
| Differential pressure measurement | Confirm the gradient between zones. | ISO 14644-3 |
| Airflow rate and velocity test | Verify laminar or turbulent flow. | ISO 14644-3 |
| Particle recovery test | Evaluate the effectiveness of the filtration system. | ISO 14644-3 |
These tests must be carried out by qualified personnel using calibrated, certified instruments.
Legal traceability: the final validation report
Every validation must be documented and traceable, including:
- Test and inspection reports.
- Equipment calibration certificates.
- Updated drawings and flow diagrams.
- Signed and approved IQ/OQ/PQ protocols.
- Material and filter certificates.
This documentation is necessary for internal audits, regulatory inspections or periodic recertifications.
Revalidation frequency
Validation is not a one-time process; it must be repeated periodically or after any significant modification to the room, such as:
- Change of use or zone reconfiguration.
- Replacement of filters or HVAC equipment.
- Structural repairs or expansions.
- Failures detected during audits.
In general, a complete annual revalidation, or one every two years, is recommended, depending on the type of installation and the requirements of the client or health authority.
Benefits of proper validation
A complete validation provides direct advantages:
- Compliance with ISO, GMP and FDA.
- Guaranteed product and staff safety.
- Lower risk of cross-contamination.
- Greater operational and energy efficiency.
- Traceability and easier audits.
- An image of reliability with clients and regulatory bodies.
Validating a cleanroom is not a simple technical check: it is the guarantee that the environment meets the safety, quality and traceability standards required by international regulations.
Cleanroom validation is an essential technical and regulatory process to ensure that facilities operate within established cleanliness, pressure and temperature parameters.
At ISL Salas Limpias, we carry out comprehensive cleanroom validations in accordance with ISO 14644, GMP and FDA standards, including IQ/OQ/PQ testing, particle testing and final certification.
Contact us to validate your cleanroom and ensure compliance with international quality standards.
