Exentec US, Inc. has become the first U.S. manufacturer to receive FM Approval for large-diameter fume exhaust duct systems under the newly revised FM Approvals 4922 standard. This certification covers the company's Fab-Tech PermaShield™ duct systems across unrestricted diameters, sizes, and vertical riser heights, enabling facility owners and engineers to construct larger mains and submains with fully approved products. The updated FM 4922 standard, revised in March 2025, introduces enhanced fire safety and performance requirements that specifically address systems above 60 inches in diameter.
A key change involves the implementation of distinct Fire Propagation Index (FPI) classifications for both the exterior and interior surfaces of ductwork, replacing the previous unified requirement. This revision mandates a separate FPI rating for the interior liner, ensuring that both external and internal components meet elevated safety thresholds, particularly for single-wall constructions where the duct wall material itself must comply with the new criteria. 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.
"We are proud to be at the forefront of industry progress," Howard said. "It also affirms our role as a trusted partner for clients seeking high-performance, compliant solutions." FM Approvals, a globally recognized certification organization, developed the updated standard to strengthen fire safety and performance requirements, reflecting a growing industry focus on rigorous safety standards and property loss prevention. The organization's website at https://www.fmapprovals.com provides detailed information about their certification processes and standards.
This achievement allows clients to benefit from products that exceed the latest safety expectations, backed by proven innovation and trusted compliance. The certification demonstrates Exentec's leadership in safety and engineering excellence while reinforcing the company's commitment to innovation and market leadership in fume exhaust duct systems. For additional details about Exentec's offerings, their official website at https://www.exentec.net serves as a resource.
