Expert ISO & GMP Cleanroom Validation. ISO Cleanroom specialises in the cleanroom validation process, providing comprehensive testing and reporting for your facility to the ISO 14644 series of classification standards. Our documentation meets the strict requirements of both ISO 14644 and EU GMP Annex 1 guaranteeing your cleanrooms are audit-ready and fully compliant with all regulatory bodies. We provide a complete qualification scope, with the exception of microbial airborne and surface contamination testing. Our CTCB-i qualified team guarantees minimal operational downtime.

Particle Count being carried out as part of Cleanroom Validation process

What is Cleanroom Validation?

The Purpose: Cleanroom validation is a rigorous, documented testing process. It provides definitive, auditable proof that your controlled environment can consistently maintain its designated airborne particulate cleanliness levels.

The Standards: It verifies that your facility performs in strict accordance with specific regulatory standards, primarily the BS EN ISO 14644 series and EU GMP Annex 1.

Validation vs. Monitoring: Validation is a formal, periodic compliance audit. Monitoring is the continuous tracking of day-to-day operational safety. They are separate but complementary processes.

Our Scope: We provide a complete physical qualification scope to make sure your cleanrooms are audit-ready for all major regulatory bodies. We handle everything with the sole exception of microbial airborne and surface contamination testing.

Cleanroom validation delivers the formal, auditable proof required by regulatory bodies to certify that your environment meets strict ISO 14644 and EU GMP standards.

IQ / OQ / PQ Explained

Cleanroom qualification is the overall process of assessing your facility's compliance with its intended use. To provide a complete validation scope, we systematically test your cleanroom across three distinct operating states:

• As-Built State (Installation Qualification / IQ): The cleanroom structure is fully completed and the infrastructure is integrated, but the room is entirely empty of equipment and operational personnel. While your primary installer will often test this state to prove the baseline installation, utilising our independent, third-party validation offers enhanced, objective assurance.
• At-Rest State (Operational Qualification / OQ): All specified production machinery is fully installed and populated, but the environment is not running (no active personnel or moving components are present). Testing at this stage establishes critical baseline data for your environmental systems before production begins.
• Operational State (Performance Qualification / PQ): The cleanroom is fully active and operating in direct accordance with your defined manufacturing processes with personnel present. This is the critical state that provides the most relevant operational assurance for final cleanroom validation. EU GMP guidelines specifically mandate validation and monitoring across both the at-rest and operational states, as well as measuring the exact recovery time required for the room to return to baseline levels post-activity.
• True cleanroom qualification requires verifying performance across all three states, As-built, At-rest, and Operational, to guarantee compliance during live manufacturing.

Cleanroom Validation as per ISO 14644

To satisfy the stringent standards of BS EN ISO 14644 Parts 1, 2, 3, 4, and 7, alongside EU GMP Annex 1, all validated cleanrooms require a precise array of physical tests executed using regularly calibrated, specialised instruments:

Particle Counting Test

• The Purpose: Verifies that the concentration of airborne particles is within your required cleanroom classification limits.
• How We Test: We use a Light Scattering Air Particle Counter (LSAPC) with a precise flow rate of 50 LPM to measure particles ranging from 0.3μm to 10μm.
• Your Proof: Our counters are calibrated yearly, and the official calibration certificate is fully documented within your final cleanroom validation report.

Air Pressure Test

• The Purpose: Confirms that air flows in the correct direction between rooms, moving from the cleanest areas into less-clean zones to block incoming contamination.
• How We Test: The cleanest area must maintain the highest pressure. We typically look for a pressure differential of 5 Pa, 10 Pa, or 15 Pa depending on your room layout. While your facility may have built-in pressure gauges, we independently verify these critical boundaries using a calibrated electric micromanometer.

Air Flow Testing

• The Purpose: Ensures your ventilation system delivers the correct volume and speed of air to properly dilute and remove contaminants.
• How We Test: Depending on your specific cleanroom design, we measure air volume supply rates (m³/s) or air velocity rates (m/s). We use a static pitot tube to measure duct velocities, and calibrated vane anemometers or airflow measuring hoods (balometers) to find the average air velocity of your filters.

Filter Integrity Test

• The Purpose: Checks that your HEPA and ULPA filters are completely free of leaks and perfectly sealed to their housings.
• Why It Matters: Even though manufacturers test filters at the factory, they can easily suffer damage during transit, installation, or from contact during routine maintenance.
• How We Test: We use either a calibrated photometer or an LSAPC. The chosen method depends entirely on whether your production process is sensitive to outgassing.

Containment Leak Test

• The Purpose: Detects whether unfiltered outside air is creeping into your controlled environment through structural seals.
• Why It Matters: Over time, standard building movements and large temperature variations can degrade the seals around wall joints, doors, ceilings, and windows.
• How We Test: We inspect these structural weak spots using a calibrated photometer paired with a Laskin nozzle aerosol generator, or via specialised LSAPCs, chosen according to your facility's outgassing sensitivity.

Recovery Test

• The Purpose: Establishes exactly how long it takes your cleanroom to clear out particulate contamination and return to its baseline cleanliness level after a brief disruption.
• How We Test: We expose the room to a brief particulate challenge using either a Laskin generator (creating a cold oil aerosol) or physical microspheres, choosing the method that safest protects your process from outgassing.

Airflow Visualisation Tests

• The Purpose: Maps and records actual air movement to prove it follows the exact paths intended by the cleanroom design.
• How We Test: We use a Laskin generator to introduce a cold oil aerosol stream, which we photograph and film to give you clear, auditable visual evidence of the airflow. For facilities sensitive to outgassing, we can use a physical taper or streamer instead.

A compliant validation routine combines core particle counts and airflow metrics with filter integrity, recovery, and pressure cascade testing to guarantee absolute contamination control.

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Validation Frequency & Re-certification

To preserve your compliant status, cleanroom validation must be executed at regular, legally defined maximum time intervals. Core testing requirements are split based on your cleanroom's classification and specific airflow design:

Commissioning & Review Intervals (Optional/Post-Change)

These optional tests are highly recommended at commissioning, every 4 years, or following significant changes to your facility:.

Customer Monitoring Tips

Cleanroom validation should not be confused with the continuous monitoring required to suit your process. We can assist in formulating your monitoring plan. Key monitoring includes Air Pressure and Particle Count (suggested daily) and Environmental controls (Temperature, Humidity, Light).

Note: These formal intervals are supplemented by routine customer monitoring guided by BS EN ISO 14644-2:2015, which suggests daily tracking of air pressure differences and particle counts.

• Maintaining continuous certification demands strict adherence to mandatory 6-month or 12-month re-testing cycles determined by your specific ISO class.

Industries Served

Our CTCB-i qualified validation team provides technical expertise across a diverse range of critical sectors operating controlled environments:

• Pharmaceutical Manufacturing: Our testing frameworks and reporting processes fulfil the strict demands of EU GMP Annex 1, providing audit-ready precision for highly regulated facilities where compliance is a non-negotiable operational standard.
• Medical Device Production: We protect critical components from particle contamination during assembly, packaging, and sorting procedures.
• Semiconductor & Microelectronics Fabrication: We guarantee absolute environmental baseline controls using advanced equipment setups (such as LSAPCs, tapers, or streamers) that completely prevent risky chemical outgassing.
• Our validation methodology satisfies the distinct regulatory pathways of the pharmaceutical, medical device, and semiconductor industries while preventing unnecessary operational downtime.

Deliverables & Documentation

When executing a cleanroom validation, the final documentation package is your primary asset for passing regulatory inspections.

• Interim Report: We provide immediate performance feedback and data summaries before our team leaves your facility.
• Final Documentation Pack: You receive a completely transparent dataset, including a tailored future testing schedule for internal quality controls.
• Calibration Certificates: We include the official, yearly calibration certificates for all testing instrumentation used on-site (such as our Light Scattering Air Particle Counters and electric micromanometers) to guarantee total traceability for external regulatory audits.
• Every cleanroom service concludes with an immediate interim report, a customised testing schedule, and a fully traceable final validation portfolio backed by calibrated instrument certificates.

Ensure Compliance & Protect Your Process. Book your cleanroom validation today.

Our Specialist Controlled Environment Services

To ensure your facility remains compliant throughout its entire lifecycle, explore our full suite of supporting services:

• Cleanroom Design – Professional schematics and ISO 14644-4 planning.
• Cleanroom Build – Turnkey construction and structural installation.
• Cleanroom System Build – Advanced modular and bespoke structural solutions.
• Cleanroom Maintenance – Planned preventative maintenance and repairs.
• Cleanroom Upgrades – Modernising and expanding existing controlled zones.

Scalable and Temporary Solutions:

• Cleanroom Rental – Certified environments for short-term projects.
• HEPA Enclosure – Localised contamination control.
• ISO Hood – Precision laminar flow workstations.