NewsRamp is a PR & Newswire Technology platform that enhances press release distribution by adapting content to align with how and where audiences consume information. Recognizing that most internet activity occurs outside of search, NewsRamp improves content discovery by programmatically curating press releases into multiple unique formats—news articles, blog posts, persona-based TLDRs, videos, audio, and Zero-Click content—and distributing this content through a network of news sites, blogs, forums, podcasts, video platforms, newsletters, and social media.
FAQ: Exentec's FM Approval for Large-Diameter Fume Exhaust Duct Systems
TL;DR
Exentec gains a market edge as the first U.S. manufacturer with FM Approval for large duct systems over 60 inches, offering clients a compliant and high-performance advantage.
Exentec's Fab-Tech PermaShield duct systems now meet the revised FM 4922 standard, which requires separate Fire Propagation Index ratings for interior and exterior surfaces.
This certification advances industry safety standards, helping protect facilities and communities by ensuring duct systems exceed rigorous fire safety and performance requirements.
Exentec achieved a first by securing FM Approval for duct systems exceeding 60 inches, aligning with updated standards that now test interior and exterior surfaces separately.
Found this article helpful?
Share it with your network and spread the knowledge!
Exentec US, Inc. has received FM Approval under the newly revised FM Approvals 4922 standard for its large-diameter fume exhaust duct systems, making it the first U.S. manufacturer certified for duct systems exceeding 60 inches in diameter.
This makes Exentec the first U.S. manufacturer to receive FM Approval for duct systems over 60 inches in diameter, demonstrating leadership in safety and engineering excellence while allowing facility owners and engineers to construct larger duct systems with FM Approved products.
Exentec's Fab-Tech PermaShield™ duct systems have secured FM Approval across unrestricted diameters, sizes, and vertical riser heights.
The March 2025 revision introduced distinct Fire Propagation Index (FPI) classifications for both exterior and interior duct surfaces, with new testing protocols specifically targeting systems above 60" in diameter, replacing the previous unified FPI requirement.
The revision now mandates a separate FPI rating for the interior liner, ensuring both external and internal components meet elevated safety thresholds, which is particularly relevant for single-wall constructions where the duct wall material itself must comply.
Jim Howard is the General Manager of the Exhaust and Abatement team at Exentec, who stated that this certification reflects their dedication to engineering excellence and proactive approach to evolving safety standards, affirming their role as a trusted partner for clients.
Exentec serves high-tech industries including semiconductors, life sciences, energy, and data centers with expertise in cleanroom environments, gas and chemical supply systems, modular solutions, and advanced HVAC.
Media should contact John Prydderch, Head of Marketing & Communications, at Phone: +44 7818 558724 or Email: john.prydderch@exyte-hargreaves.net. The press office only answers questions from journalists.
It allows larger duct systems such as mains and submains to be constructed with FM Approved products, providing high-performance, compliant solutions that meet and exceed the latest safety expectations.
The announcement was made on December 16, 2025, and the FM 4922 standard was revised in March 2025.
Curated from 24-7 Press Release
