Industry Insights

World BioHazTec has been a leader in biosafety and biosecurity since its inception in 1995. Over the years, we have successfully completed numerous groundbreaking projects and received prestigious awards, showcasing our dedication to excellence and innovation.

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Blue and yellow exhaust duct air valves

Why Installed-Condition Testing Matters: A Closer Look at BSL 3 Exhaust Duct Air Valve Verification

Testing and verifying the performance of BSL‑3 containment exhaust systems is one of the most critical—and often least visible—components of commissioning. As organizations work to balance constructability, cost considerations, and compliance, it is essential to ensure that verification methods align fully with the intent of applicable standards. Maintaining clarity around containment exhaust testing requirements is essential for any BSL‑3 project. The discussion surrounding the exhaust duct air valve has provided an opportunity to revisit the relevant standards and ensure that the verification approach accurately reflects installed‑condition performance expectations. 1. Compliance Is About the Installed System—Not Just Component Ratings A common area of confusion in laboratory and containment design is the difference between component‑level ratings and installed‑system performance. While manufacturer data or nominal pressure ratings for an exhaust air valve provide useful baseline information, they do not demonstrate compliance with the performance verification requirements of: ANSI Z9.14 – Testing and Performance Verification of Laboratory Fume Hoods and Containment Systems ASME N510 – Testing of Nuclear Air Cleaning Systems Both standards require testing of the entire installed exhaust assembly, which includes: The valve Upstream and downstream ductwork Field joints and couplings Gaskets, sleeves, transitions, and associated connections System leakage almost always occurs at field‑assembled interfaces rather than inside a factory‑tested component. That’s why only installed‑condition testing can confirm the containment integrity required for BSL‑3 operation. 2. Bench Testing Is Useful—But Not Sufficient for Acceptance Bench tests can help validate a component’s general capability, and in some cases may even demonstrate performance above expected operating conditions (such as exceeding 4" w.g.). However, these tests cannot replicate: Real-world mechanical stresses on ductwork Variations introduced during installation Joint expansion and contraction Multiple potential leakage pathways Interaction with adjacent system components As a result, bench testing alone cannot be used to demonstrate compliance with ANSI Z9.14 or ASME N510. Installed-condition testing is the only reliable method to verify that the complete exhaust system performs as required. 3. Commissioning Tests Required by Standards Are Not Optional Project contracts may dictate who performs or pays for certain tests, but they do not change whether those tests are required. For acceptance under ANSI Z9.14 and ASME N510, a BSL‑3 exhaust system must demonstrate: Pressure integrity of the installed duct upstream of HEPA filtration Acceptable leakage levels across all components and joints Performance of the system as a cohesive, installed assembly These commissioning tests remain mandatory regardless of how they are allocated contractually. Safety and compliance always take precedence. 4. The Correct Approach: Installed Duct Testing Based on ANSI Z9.14 Acceptance Criteria Requirements After evaluating technical requirements and constructability constraints, the most appropriate and standards‑aligned testing method is clear: ✔ Conduct duct testing from the BSL-3 room through the air valve at 4" w.g., under fully installed conditions. This approach: Meets the intent of ANSI Z9.14 for upstream containment exhausts Verifies real‑world performance of the installed assembly Avoids overreliance on bench test data Provides defensible acceptance documentation Ensures containment integrity for BSL‑3 operations It is both a practical and technically rigorous solution. Collaborative Solutions Drive Successful Commissioning One of the most important aspects of any containment project is the ability of teams—engineering, construction, commissioning, and facility stakeholders—to work together toward solutions that uphold safety and regulatory integrity. By focusing on installed‑condition performance, aligning with recognized standards, and maintaining open communication, we can ensure the containment exhaust system achieves the level of reliability and protection that BSL‑3 environments demand. For more information or to discuss how these principles apply to your facility, contact World BioHazTec today to schedule a free consultation with our biosafety and biocontainment experts.

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2025: A Year of Global Impact and Milestones for World BioHazTec

By: Kerstin Haskell, President As we close out 2025, we’re proud to reflect on a year that showcased World BioHazTec’s commitment to advancing biosafety and biosecurity worldwide. From groundbreaking recognitions to expanding our global footprint, this year was nothing short of transformative. Celebrating Biosafety in Maryland One of our proudest achievements was obtaining our first statewide proclamation—officially recognizing Biosafety in Maryland on June 4, 2025. This milestone underscores our dedication to embedding biosafety into the fabric of science and public health. Global Consulting Across Continents 2025 was a year of international collaboration. Our team provided in-depth consulting for laboratories across 14 countries spanning five continents, reinforcing global biosafety standards and fostering safer research environments worldwide. These partnerships strengthened biosafety practices and compliance standards across diverse regions. Expanding Our U.S. Presence Domestically, we worked in 21 states, from California to Maryland and beyond—supporting government and public health labs, research institutions, and biomanufacturing facilities. Each visit reinforced our mission to safeguard global health through robust biosafety systems. Training and Capacity Building Education remained at the heart of our work. In 2025, we trained over 200 professionals worldwide. These sessions empowered scientists, facilities personnel, biosafety professionals and lab workers to innovate safely and respond effectively to emerging risks. Setting New Standards World BioHazTec became the first Singapore Accredited Scheme (SAC) company accredited to audit BSL-3 laboratories under the SS696 standard. This achievement positions us as a leader in biosafety compliance and auditing excellence. Recognition of Leadership World BioHazTec’s President was honored to receive ABSA International’s Diane Fleming Leadership Award, a testament to our unwavering commitment to advancing biosafety globally. Professional Development Milestone Three of our professionals—Dan Yoong, Lia Vizzotti, and Juan Osorio—successfully completed the inaugural Biorisk Management International ISO 35001 Auditor Course. This accomplishment strengthens our auditing expertise and reinforces our dedication to global biosafety standards. Conferences, Knowledge Sharing, and Facility Milestones Our team actively participated in major conferences and training events, including: ABSA International Conference Association for Public Health Laboratories Conferences Biorisk Management International ISO 35001 Auditor Course Biosafety Association of the Philippines Conference Chesapeake Area Biological Safety Association Annual Scientific Symposium LabConCert Annual Conference Maryland Tech Council BioInnovation Conference Thailand Biosafety Association Academic Conference USDA ARS 8th International Biosafety & Biocontainment Symposium In addition to conferences, we were honored to attend openings and milestone celebrations for several key facilities, including: Orange County Health Care Agency at the Marine Way Campus Orange County Public Health Laboratory Allegheny County Public Health Laboratory ATCC’s biomanufacturing facility construction milestone event These engagements allowed us to share expertise, celebrate progress, and strengthen partnerships across the biosafety community. Looking Ahead 2025 was a year of growth, recognition, and global impact. As we move into 2026, World BioHazTec remains committed to empowering laboratories worldwide to innovate safely and respond to emerging challenges. Thank you to our partners, clients, and colleagues for making this journey possible. Here’s to another year of advancing biosafety together!

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Biocontainment Laboratory workers in a lab

Design Pitfalls in Biocontainment Laboratories: Lessons from Real Projects

Building a biocontainment laboratory—whether BSL-3, ABSL-3 or ACL-3, is a highly specialized process that requires careful planning and coordination. When design decisions are made without early input from Subject Matter Experts (SMEs), critical issues often surface late in the project, leading to costly changes and delays. Below are examples of common challenges identified during design reviews and commissioning phases. These illustrate why early integration of biosafety and engineering expertise is essential. Example 1: Missing Containment Features In one recent project, a design review uncovered a critical oversight. The Basis of Design (BOD)—the document outlining the institution’s requirements for the laboratory—specified that the facility would support research involving avian influenza. However, the design did not include provisions for a shower-out protocol or the necessary plumbing infrastructure to accommodate a future effluent decontamination system, both of which may be required by evolving regulations. This omission significantly limited the laboratory’s operational capabilities, restricting it to work with agents that do not require a shower-out process. Ultimately, substantial redesign was needed to bring the project back into alignment with the BOD and ensure long-term compliance and flexibility. Other issues included: In a BSL-3 setting, undefined personnel pathways and workflows create unclear boundary separations, increasing the risk of containment breaches, procedural confusion, and noncompliance biosafety requirements. Insufficient clearance for biosafety cabinets (BSCs) in isolation spaces. Doors swinging against intended airflow direction. Use of inappropriate sealing materials for penetrations. Inclusion of a fume hood for chemical work instead of a Class II Type B2 BSC. Incomplete risk assessment during early design phases. Insufficient attention to maintenance access and laboratory equipment placement. Structural limitations in the room envelope made it unable to safely tolerate deep negative pressure conditions. Impact: These oversights affected containment integrity and workflow efficiency, requiring structural changes late in the process. Example 2: Airflow and Equipment Integration During commissioning of a facility under construction, several design gaps were identified: A BOD change required upgrading the Class II BSC from Type A2 to Type B2, but the existing exhaust fan curves could not support the increased airflow demand. Lack of exhaust ducting over the autoclave chambers to manage heat and connecting to the BSL-3 exhaust ductwork. Freezer placement in a concentrated area not accounted for in the air distribution. Provision for decontaminating large equipment before removal. Autoclave bioseal ordered for the wrong side with the master control on the wrong side. Impact: These issues prolonged commissioning, delayed the project schedule, and resulted in substantial change-order claims. Example 3: HVAC and Containment Compliance In another case, evaluation of arthropod containment labs revealed: Omission of supply and/or exhaust air in anterooms. Misinterpretation of containment guidelines led to improper combining of BSL-2 and BSL-3 exhaust ductwork. Non-airtight ceiling access doors and introducing unaccounted infiltration affecting directional airflow. HVAC airflow reversals during failure testing created unacceptable containment risks. Impact: These deficiencies increased the risk of containment loss, with airflow reversals posing the greatest safety threat and pest intrusion creating major USDA compliance concerns. Top 6 Design Principles for Biocontainment Labs To avoid these pitfalls, consider these foundational principles during the earliest stages of design: 1.Define the Research Capabilities of the Laboratory Clearly defining laboratory intent in the Basis of Design is essential to ensure the facility is engineered to meet its functional, safety, and regulatory requirements. 2. Define Containment Boundaries Clearly Establishing primary, secondary, and tertiary barriers in relation to workflow early ensures the laboratory’s containment strategy is clear, coordinated, and integrated into the design from the start. This prevents costly redesigns, reduces construction risk, and supports reliable, compliant biocontainment performance. 3. Plan for Directional Airflow and Pressure Differentials Ensure airflow moves from clean to contaminated areas, with validated pressure relationships and redundancy in HVAC systems. 4. Integrate Equipment into Design Account for biosafety cabinets, autoclaves, and other critical equipment in spatial layouts and airflow calculations to ensure sufficient make-up air and proper cooling and heat-load dissipation. 5. Design for Maintenance and Decontamination Include provisions for safe removal and decontamination of large equipment and keep serviceable maintenance items outside of containment where possible. 6. Follow Risk-Based Guidelines and Standards Align with Biosafety in Microbiological and Biomedical Laboratories (BMBL), NIH Design Requirements Manual, WHO Laboratory Biosafety Manual and other relevant standards to ensure compliance and operational safety from the start. The Bottom Line Early engagement with World BioHazTec’s SMEs ensures: Compliance from the start with WHO, CDC, NIH, ANSI/ASSP Z9.14-2014 and other applicable guidelines. Cost savings by avoiding late-stage redesigns. Operational efficiency through risk-based design and redundancy planning. Don’t wait until commissioning to discover design flaws. Partner with World BioHazTec early and build a laboratory that meets the highest standards of safety and functionality. Ready to start your project right? Contact us for a free consultation.

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World BioHazTec is an Accredited Provider (AP) of the International Association for Continuing Education and Training (IACET). As an IACET Accredited Provider, World BioHazTec offers IACET CEUs for its learning events that comply with the ANSI/IACET Continuing Education and Training Information.

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