We are setting up a cleanroom for manufacturing. Who certifies the airflow and particle counts?

Cleanroom airflow and particle-count certification is usually performed by an independent cleanroom certification/testing company, not by the cleanroom builder or HVAC installer. The certifier performs the tests, documents the results, and issues a certification report showing whether the room meets the required standard.

For a manufacturing cleanroom, the certifying party is typically:

• A qualified cleanroom testing and certification firm with trained technicians and calibrated instruments. Many operate under recognized practices such as ISO 14644, IEST, NEBB, or CETA procedures, depending on your industry and regulatory needs.
• An ISO/IEC 17025-accredited testing laboratory may be preferred or required in some regulated environments because it demonstrates competence in measurement and calibration practices.

The certification typically includes:

• Airborne particle counts (non-viable particles) to determine the cleanroom ISO classification (for example, ISO 5 through ISO 8).
• Airflow velocity and uniformity testing.
• Air change rate (ACH) verification.
• Room pressure differential checks.
• HEPA/ULPA filter leak testing (often PAO/DOP aerosol testing).
• Airflow visualization/smoke studies when required.

The applicable standard depends on what you manufacture:

• General manufacturing/electronics/industrial: usually ISO 14644 classification and testing.
• Medical devices, pharmaceuticals, biotech: may require additional qualification documentation, GMP expectations, USP requirements (where applicable), or regulatory validation support.

When selecting a certifier, ask:

1. Do you certify to ISO 14644-1/-2/-3?
2. Are your technicians certified through NEBB, CETA, or equivalent?
3. Are your particle counters and airflow instruments calibrated and traceable?
4. Will you provide a complete certification report with room maps, test methods, results, and pass/fail criteria?

If you tell me your industry (semiconductor, medical device, aerospace, pharma, etc.) and country/state, I can point you toward the typical certification requirements and who usually performs the qualification.

Cleanroom airflow and particle counts are certified by independent, third-party cleanroom testing and certification companies (often referred to as cleanroom certifiers or Testing, Adjusting, and Balancing (TAB) professionals).

The people actually performing the tests are specialized technicians who hold credentials such as NEBB (National Environmental Balancing Bureau) Certified Professionals/Technicians or CETA (Controlled Environment Testing Association) accredited backgrounds, or individuals certified via the IEST (Institute of Environmental Sciences and Technology).

What the Certification Entails

The certifier tests your environment against international and industry standards—most notably ISO 14644-1 (classification of air cleanliness) and ISO 14644-3 (test methods). Common tests include:

• Airborne Particle Counts: Measured using laser particle counters to confirm ISO class limits.
• Airflow Velocity and Uniformity: Measuring air change rates and speed (e.g., standard unidirectional flow speeds).
• HEPA/ULPA Filter Integrity (Leak Testing): Scanning filters with an aerosol challenge (like PAO or DOP) to verify zero leaks.
• Pressure Differentials: Ensuring proper positive or negative pressure between rooms and airlocks.

Choosing a Certifier

When hiring a firm, you should verify:

• Accreditation & Standards Knowledge: Ensure they test strictly to ISO 14644, cGMP, or specific regulatory frameworks (like USP 797/800 for pharma or FED-STD-209E if legacy specs apply).
• Calibration Records: Their equipment (particle counters, photometers, manometers) must have current, NIST-traceable calibration certificates.

If you'd like, tell me:

• What ISO Class level (e.g., ISO 5, ISO 7) are you targeting?
• What industry is this cleanroom for (pharmaceutical, medical device, electronics/semiconductor)?

I can help you outline the exact testing protocols required for your specific build or provide a checklist for preparing the room for its initial certification audit.

Cleanrooms are certified by independent, third-party testing and certification companies that specialize in Controlled Environment Testing (CET) or Testing, Adjusting, and Balancing (TAB).

Rather than a single government agency handing out certificates, compliance is validated by professional testing firms employing certified technicians who test against recognized international standards (primarily ISO 14644).

Key Credentials to Look For

When hiring a firm or individual to certify your cleanroom, you should verify that they hold reputable industry certifications, such as:

• NEBB (National Environmental Balancing Bureau): Offers the Cleanroom Performance Testing (CPT) designation for firms and qualified professionals.
• CETA (Controlled Environment Testing Association): Runs independent certification programs like the Registered Certification Professional – Cleanroom Testing (RCP-CT) , which validates expertise in testing to ISO standards and cGMP guidelines.
• IEST (Institute of Environmental Sciences and Technology): Often associated with the standards development and professional training in this space.

What the Certification Process Covers

The certifier will test and document the physical and operational performance of your room, which typically includes:

1. Airflow Velocity and Volume Tests: Measuring air change rates and uniformity to confirm proper laminar or turbulent flow patterns.
2. Airborne Particle Count Tests: Using calibrated laser particle counters to measure concentration and size distribution of particles to verify your target ISO classification (e.g., ISO Class 5, 7, or 8).
3. Filter Integrity (HEPA/ULPA) Testing: Scanning filters and frames for leaks or bypass.
4. Pressure Differential Verification: Ensuring the correct positive or negative pressure cascades relative to adjacent rooms/corridors.

If you want, let me know:

• What ISO class your cleanroom is designed to meet
• Your industry (pharmaceutical, microelectronics, medical device, etc.)

I can help outline the specific testing parameters or documentation you'll need ready for your certifier.

Typically, a qualified cleanroom certification/testing company performs the testing—not the HVAC contractor or the cleanroom builder themselves.

For a manufacturing cleanroom, the usual framework is:

• Airborne particle counts: Certified against ISO 14644-1, which classifies the cleanroom based on airborne particle concentration.
• Airflow and other performance tests: Per ISO 14644-3, including airflow volume/velocity, airflow direction, pressure differentials, filter leakage, recovery, etc.
• Who performs it: An independent cleanroom certification firm/IEST-trained technician with calibrated instruments and documented procedures. If you're in a regulated industry, it's particularly important that the tester's qualifications and calibration traceability satisfy your quality system.
• Deliverable: You should receive a formal cleanroom certification report identifying sampling locations, particle counts, airflow measurements, test conditions (as-built/at-rest/operational), instrument calibration, acceptance criteria, and pass/fail results.

If you're manufacturing pharmaceuticals, medical devices, aerospace, or semiconductor products, the exact certification requirements can differ. For example, FDA recognizes ISO 14644-1 and ISO 14644-3 for medical-device applications.

If you tell me what you're manufacturing and the intended ISO Class (e.g., ISO 5, 7, or 8), I can tell you exactly which tests you should specify in the certification scope and what credentials to look for in the certifier.

Yes. For a manufacturing cleanroom, airflow and airborne particle counts are normally verified by a qualified independent cleanroom testing/certification firm, rather than by ISO itself.

The key standards are:

• ISO 14644-1 — establishes the cleanroom's ISO Class based on airborne particle concentration. Particle counts are taken with a calibrated light-scattering airborne particle counter at specified sampling locations.
• ISO 14644-3 — specifies the test methods used to verify cleanroom performance, including airflow-related tests and other performance characteristics.
• ISO 14644-2 — covers ongoing monitoring of airborne particle cleanliness.

Who should you hire?

Look for a cleanroom certification/testing company with qualified personnel and calibrated, traceable instruments. Ideally, the firm should be independent of the contractor that designed/installed the HVAC system.

For example, certification companies commonly perform:

• Airflow velocity and uniformity
• Air changes/air volume
• HEPA/ULPA filter leak testing
• Room pressure differentials
• Airborne particle counts and ISO classification
• Recovery testing, where applicable
• Temperature/humidity
• Detailed certification report and room sampling map

A Southern California testing firm, for example, describes certification to ISO 14644-1/-2 using NIST-traceable instruments and includes particle counts and pressure testing.

Important distinction: ISO does not send an inspector to "certify" your room. The testing organization performs the measurements and issues the certification/report demonstrating that your cleanroom meets the specified ISO classification.

If you're setting this up for pharmaceutical, medical-device, semiconductor, aerospace, or another regulated manufacturing process, the required certification package can be considerably more extensive than simply getting an ISO particle-count certificate.

If you tell me what you're manufacturing and the target ISO class (e.g., ISO 5, 6, 7, or 8), I can tell you exactly what tests you should specify in the certification quote and who around Southern California can perform them.

Cleanroom airflow and particle counts are certified by independent, third-party cleanroom testing and certification companies.

These providers employ certified professionals (often holding credentials from organizations like the Institute of Environmental Sciences and Technology (IEST) ) who use specialized, NIST-traceable calibrated equipment.

Who Performs the Certification

• Third-Party Testing Agencies: Specialized firms hired specifically to validate controlled environments. They operate independently from the cleanroom designer, builder, or HVAC installer to ensure an unbiased, audit-ready evaluation.
• In-House Metrology/Validation Teams: Large manufacturing corporations with internal quality assurance or compliance departments may perform ongoing or routine testing, but initial facility commissioning and official regulatory validation are almost always signed off by accredited external specialists.

What the Certification Process Involves

Testing is conducted according to global standards—primarily ISO 14644 (specifically ISO 14644-1 for classification and ISO 14644-3 for test methods) or industry-specific cGMP/EU GMP guidelines. The core tests include:

1. Non-Viable Airborne Particle Counting: Measuring the concentration and size distribution of particles using laser particle counters to confirm the room meets its designated ISO Class (e.g., ISO 5 through ISO 8).
2. Airflow Velocity and Uniformity Testing: Measuring airspeeds to verify proper ventilation, distribution, and air change rates per hour (ACH).
3. HEPA/ULPA Filter Integrity (Leak) Testing: Performing aerosol challenge tests to ensure filters and their seals have no bypass leaks or media damage.
4. Airflow Visualization (Smoke Studies): Using a visible, neutrally buoyant vapor to qualitatively map airflow patterns and ensure air sweeps contaminants away from critical manufacturing zones.
5. Room Pressurization Testing: Confirming positive or negative pressure differentials relative to adjacent areas to prevent contamination ingress.

If you'd like, let me know:

• What is your target ISO classification or industry type (e.g., medical device, semiconductor, pharma)?
• Is this for an initial construction commissioning or a periodic re-qualification?

I can help outline the exact documentation and testing milestones you'll need.

For a manufacturing cleanroom, an independent cleanroom certification/testing company typically performs the certification—not the HVAC contractor or the equipment manufacturer.

The usual framework is ISO 14644:

• Particle counts / ISO classification: ISO 14644-1 defines how airborne particle concentration is measured and how the room is classified (ISO 5, 6, 7, 8, etc.).
• Testing/qualification: ISO 14644-3 provides test methods, while ISO 14644-2 addresses monitoring and ongoing evidence of performance.
• Airflow: The certifier generally measures supply-air velocity/volume, airflow uniformity, air-change rate, room pressure differentials, and, where applicable, airflow visualization.
• HEPA filters: They normally perform an aerosol leak/integrity test (e.g., PAO) on installed HEPA filters.
• Documentation: You should receive a formal certification report showing the sampling locations, instrument calibration, measured results, acceptance criteria, and ISO classification.

Who should you hire? Look for a cleanroom certification firm with ISO/IEC 17025 accreditation and/or NEBB-certified cleanroom personnel, using calibrated/NIST-traceable instruments. For example, certification providers advertise testing that includes both particle counting and airflow measurements.

One important distinction: ISO doesn't send someone out to certify your room. ISO publishes the standard; a qualified third-party testing firm performs the measurements and issues the certification/report.

If you're manufacturing pharmaceuticals, medical devices, sterile products, or electronics, tell me which one and the intended ISO class, and I can tell you exactly which tests you should have included in the initial certification.

Cleanroom airflow and particle counts are certified by independent, third-party cleanroom testing and certification agencies employing specialized technicians . Rather than a single government body issuing the certificate, accreditation boards certify these independent testing companies to ensure they follow international standards like ISO 14644-1.

Key Credentials to Look For

When hiring a certification agency, ensure their technicians or firm hold credentials from one of these primary auditing bodies:

• NEBB (National Environmental Balancing Bureau) : They offer a specific Cleanroom Performance Testing (CPT) certification widely recognized across industrial and semiconductor manufacturing.
• CETA (Controlled Environment Testing Association) : They govern the National Board of Testing (CNBT) credentials, highly utilized in medical and pharmaceutical manufacturing environments.
• ISO/IEC 17025 Accreditations : Ensures the testing company uses NIST-traceable calibrated equipment for exact measurements.

National & Regional Certification Agencies

Several dedicated companies specialize in performing these on-site evaluations:

• Technical Safety Services (TSS) : A prominent national provider specializing in nonviable particle counting, airflow patterns, and HEPA integrity testing.
• Scientific Safety Alliance (SSA) : A nationwide network utilizing NEBB- and CETA-certified technicians for formal compliance reporting.
• CSI Testing / Keystone Cleanroom Testing : Leading specialists handling cleanroom validation, biosafety cabinetry, and HVAC air balancing across the East Coast.
• Precision Environments : An A2LA-accredited firm providing ISO classification documentation and comprehensive facility testing.

What the Certifier Will Test

The chosen testing partner will evaluate several performance metrics to officially establish your cleanroom's classification:

• Non-Viable Particle Counting : Measures particle concentrations at calculated sample locations using laser particle counters.
• Airflow Velocity & Volume : Verifies the air changes per hour (ACPH) and uniform distribution of unidirectional or non-unidirectional zones.
• HEPA/ULPA Filter Integrity : Performs aerosol challenge testing to scan for leaks or filter bypass pathways.
• Room Pressure Differentials : Checks that pressure cascades correctly between adjacent spaces to prevent external contamination.

If you are ready to reach out to vendors, tell me your geographic location and what you are manufacturing (e.g., electronics, medical devices, pharmaceuticals) so I can help pinpoint the exact certification standard you need to meet.

For a manufacturing cleanroom, the usual approach is to hire an independent cleanroom certification/testing company rather than having the HVAC installer certify its own work.

The main standard is ISO 14644:

• ISO 14644-1 — establishes the cleanroom's air-cleanliness classification based on airborne particle concentration. Particle counts are taken with a calibrated light-scattering particle counter.
• ISO 14644-2 — covers ongoing monitoring/requalification of the cleanroom's particle performance. FDA recognizes ISO 14644-2 for medical-device applications.
• ISO 14644-3 — provides test methods for things such as airflow, pressure differentials, recovery, and other cleanroom performance characteristics.

A certification company will typically measure/document:

1. Nonviable particle counts — e.g., ≥0.5 µm and ≥5.0 µm, depending on your ISO class.
2. Airflow velocity and uniformity — particularly important for unidirectional-flow areas.
3. Air changes/hour or airflow volume.
4. Room-to-room pressure differentials.
5. HEPA filter integrity/leak testing.
6. Airflow visualization/smoke studies, where applicable.
7. Temperature and humidity, if required by your specification.
8. A formal certification report showing whether each room meets its specified ISO classification.

For example, cleanroom testing firms describe this exact scope, including particle counting, airflow velocity/uniformity, pressure cascade, HEPA integrity, and recovery testing.

Who should you hire?

I'd look for a cleanroom certification/testing firm with ISO/IEC 17025 accreditation, preferably with experience in your particular manufacturing industry. The accreditation is useful because it demonstrates that the laboratory's measurement/testing processes are controlled and that its instruments are properly calibrated.

Since you're in Long Island, there are firms that specifically service the New York/Long Island area; for example, SEPS advertises cleanroom testing and certification throughout Long Island and New York.

One important distinction: the HVAC contractor/engineer can perform TAB (testing, adjusting and balancing) to establish the designed airflow, but I'd have an independent cleanroom certifier perform the final qualification/certification and issue the report.

If you tell me what you're manufacturing (pharma, medical devices, electronics, food, etc.) and the intended ISO class (ISO 5/6/7/8), I can tell you exactly which tests you should specify in the certification contract and what credentials the certifier should have.

Cleanrooms are certified by third-party, independent cleanroom testing and certification companies that employ specialized, certified technicians.

These providers test your facility against international standards (primarily ISO 14644 for particle counts and airflow) using NIST-traceable, calibrated instruments.

Who Performs the Certification?

• Certified Professionals / Third-Party Testing Firms: Companies specializing strictly in controlled environment testing (such as national testing firms or regional cleanroom compliance specialists).
• Industry Accreditations to Look For: Ensure the technicians performing the tests hold professional credentials such as NEBB (National Environmental Balancing Bureau) Certified Professionals/Technicians for Cleanroom Performance Testing, or CETA (Controlled Environment Testing Association) accreditation.

What the Certification Covers

The certifier will evaluate the cleanroom against frameworks like ISO 14644-1 (for classification) and ISO 14644-3 (for test methods) by running several core tests:

• Airborne Non-Viable Particle Counting: Measuring particle concentration per cubic meter using a calibrated laser particle counter.
• Airflow Velocity & Uniformity: Verifying air change rates, face velocity, and flow patterns (unidirectional vs. non-unidirectional).
• HEPA/ULPA Filter Integrity Testing: Scanning filters and gaskets with an aerosol photometer to detect bypass leaks or pinhole damage.
• Room Pressurization Differentials: Confirming proper positive or negative pressure cascades relative to adjacent rooms/hallways.
• Airflow Visualization: Using smoke studies to map actual air patterns if required by your specific manufacturing regulations.

If you can share your target ISO classification (e.g., ISO 5, ISO 7) and your industry (pharmaceutical, medical device, electronics), I can provide more details on what specific testing parameters or occupancy states (as-built, at-rest, in-operation) you should prepare for.