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Cleanroom Certification & Air Filtration Articles

Technician inspecting HEPA filter in cleanroom
Certification Standards

HEPA H14 vs ULPA: Which Filtration Standard Meets NRC Canada Requirements?

Choosing between HEPA H14 and ULPA filtration depends on your cleanroom classification and the specific NRC Canada certification protocols you must follow. This article breaks down the particle retention efficiency at 0.3 and 0.1 microns, the impact on airflow resistance, and the cost implications for pharmaceutical and semiconductor facilities. We also review real certification data from recent audits to show how each filter type performs under CAN/CSA Z317.2 testing conditions.

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Cleanroom technician performing air sampling
Air Sampling & Monitoring

How to Set Up Isokinetic Air Sampling for NRC Cleanroom Certification

Proper isokinetic air sampling is critical for accurate microbial and particulate counts during NRC Canada certification. This guide covers probe placement, flow rate calibration between 28.3 and 100 L/min, and the difference between viable and non-viable sampling in a single pass. We walk through a step-by-step setup for a Class 5 cleanroom, including common mistakes that lead to failed certification and how to avoid them.

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HVAC control panel in industrial facility
System Design

Pressurization Cascade Design for Multi-Zone Cleanrooms: A Practical Guide

Maintaining differential pressure cascades between 15 and 30 Pa across multiple cleanroom zones is essential for contamination control and NRC compliance. This article explains how to design a pressurization system using VAV modules, redundant fans, and BACnet integration for real-time monitoring. We include a case study from a recent GMP facility retrofit where cascade failures were resolved by adjusting damper sequences and alarm thresholds.

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Cleanroom Certification & Filtration FAQs

Straight answers about NRC compliance, HEPA standards, and maintaining ISO-classified environments in Canadian manufacturing facilities.

What NRC standards apply to cleanroom certification in Canada?

Cleanroom certification in Canada follows CAN/CSA Z317.2 and the National Research Council’s guidelines for controlled environments. These standards cover particulate limits, airflow patterns, pressure differentials, and microbial monitoring. Our certification services align with the latest NRC protocols for pharmaceutical, medical device, and semiconductor facilities.

How often should HEPA filters be replaced in a manufacturing cleanroom?

HEPA filter replacement intervals depend on pre-filter efficiency, particle load, and room classification. For ISO Class 5 to Class 8 cleanrooms, we recommend annual DOP testing and filter replacement every 2–3 years under normal operating conditions. Facilities with high particulate generation may need semi-annual changes. Our team provides scheduled filter audits as part of the maintenance contract.

What is the difference between ISO Class 5 and ISO Class 7 cleanrooms?

ISO Class 5 allows a maximum of 3,520 particles per cubic meter at 0.5 microns, while ISO Class 7 allows 352,000 particles at the same size. Class 5 requires HEPA H14 or ULPA filters, full gowning, and strict air change rates (240–600 per hour). Class 7 typically uses HEPA H13 filters with lower air change rates (60–90 per hour). The choice depends on your product sensitivity and regulatory requirements.

Do you provide certification for existing cleanrooms or only new installations?

We certify both new and existing cleanrooms. For existing facilities, we perform a baseline assessment, identify gaps in airflow or filtration, and recommend upgrades to meet current NRC standards. Recertification is typically required annually or whenever major HVAC modifications occur. We also offer emergency recertification for facilities that fail an audit.

What is included in a standard cleanroom certification package?

A standard certification includes particle count testing at rest and in operation, airflow velocity and uniformity measurement, HEPA filter integrity testing (DOP/PAO), pressure differential verification between zones, temperature and humidity logging, and a detailed report with pass/fail criteria. Optional add-ons include microbial sampling, UV-C system validation, and NRC documentation review.

How long does a typical cleanroom certification take?

A single-zone cleanroom (up to 500 sq ft) takes 4–6 hours for full certification. Multi-zone facilities with 3–5 rooms require 1–2 days depending on complexity and access. We schedule certifications during planned downtime to minimize production disruption. Rush certification within 48 hours is available for an additional fee.

Terms & Clarifications

Definitions and conditions that govern our cleanroom certification and air filtration services, aligned with National Research Council of Canada standards.

What does “NRC-compliant” mean in practice?

NRC compliance refers to alignment with CAN/CSA Z317.2 and related National Research Council of Canada guidelines for cleanroom design, operation, and certification. For our clients, this means every air sampling probe array, filtration unit, and pressurization system we install is tested against the same protocols used by NRC auditors. We do not claim blanket approval — each installation is verified on-site against the specific NRC standard applicable to the facility’s classification.

Are your HEPA H14 units certified for ISO Class 5 environments?

Yes. Our HEPA H14 Ceiling-Mounted Filtration Unit is tested to 99.995% efficiency at 0.3 microns, meeting ISO Class 5 requirements. Certification is provided per unit with a test report traceable to an accredited laboratory. The unit must be installed in a system that maintains the required airflow and pressure differentials — the filter alone does not guarantee room classification.

What is the difference between viable and non-viable sampling?

Viable sampling captures living microorganisms (bacteria, fungi) using culture media; non-viable sampling measures particulate counts without regard to biological activity. Our NRC-Compliant Air Sampling Probe Array supports both methods in a single pass, using separate collection paths to avoid cross-contamination. This reduces certification downtime by eliminating the need for sequential runs.

Do you provide ongoing calibration after installation?

We offer annual recalibration services for all installed equipment, including HEPA filter integrity testing (PAO/DOP), airflow verification, and differential pressure sensor calibration. These services are separate from the initial certification and are billed per visit. Calibration certificates are issued in accordance with ISO/IEC 17025 guidelines where applicable.

What happens if a system fails certification during commissioning?

If a system does not meet the agreed-upon classification during initial commissioning, we perform a root-cause analysis at no additional charge. Remediation — such as duct sealing, filter replacement, or airflow balancing — is quoted separately. We do not charge for the diagnostic visit, but parts and labor for corrective work are billed at standard rates.

Can your modular pressurization system integrate with existing BMS?

Yes. The Modular Cleanroom Pressurization System supports BACnet MS/TP, BACnet/IP, and Modbus RTU protocols. Integration requires a compatible BMS controller and a network gateway if the existing system uses a different protocol. We provide wiring diagrams and register maps, but on-site integration programming is handled by the client’s BMS provider unless otherwise arranged.

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