Exentec US, Inc. has achieved certification under the newly revised FM Approvals 4922 standard for its large-diameter fume exhaust duct systems. This certification makes Exentec the first U.S. manufacturer to receive FM Approval for duct systems exceeding 60 inches in diameter, demonstrating leadership in safety and engineering for industrial applications.
The company secured FM Approval for its Fab-Tech PermaShield™ duct systems across unrestricted diameters, sizes, and vertical riser heights. This allows facility owners and engineers to construct larger duct systems, such as mains and submains, with FM Approved products. Jim Howard, General Manager of the Exhaust and Abatement team at Exentec, stated that this certification reflects the company's dedication to engineering excellence and proactive approach to evolving safety standards, affirming its role as a trusted partner for high-performance, compliant solutions.
FM Approvals, a globally recognized certification organization, recently updated its 4922 standard to strengthen fire safety and performance requirements for duct systems. The revision introduces distinct Fire Propagation Index (FPI) classifications for both exterior and interior surfaces of ductwork, with new testing protocols specifically targeting systems above 60 inches in diameter. These enhancements reflect a growing industry focus on rigorous safety standards and property loss prevention.
Previously, the standard applied a unified FPI requirement across the entire duct system. The March 2025 revision now mandates a separate FPI rating for the interior liner, ensuring both external and internal components meet elevated safety thresholds. This update is particularly relevant for single-wall constructions, where the duct wall material itself must comply with the new criteria. More information on the standard can be found at https://www.fmapprovals.com.
The updated FM 4922 standard and Exentec's certification underscore a shared commitment to advancing duct system reliability and performance. Clients in sectors such as semiconductors, life sciences, energy, and data centers can now benefit from products that exceed the latest safety expectations, backed by proven innovation and trusted compliance. This development is crucial for industries where mission-critical operations depend on robust safety measures to prevent property loss and ensure operational continuity. For additional details about Exentec's offerings, visit https://www.exentec.net.
