The International Mechanical Code (IMC) requires that duct insulation contained in plenum spaces pass ASTM E84 or UL 723 25/50 Flame Spread/Smoke Developed Index.
Article content provided by Aeroflex

Visit the AEROFLEX website to learn more.
Contact an AEROFLEX representative.
Aeroflex USA manufactures the AEROFLEX® brand of EPDM closed-cell elastomeric pipe, duct & equipment insulation in Sweetwater, TN and offers owners, engineers and contractors high-quality, single-source, hermetic EPDM insulation system solutions engineered to ensure success and long-term performance.
May 22, 2026 — Products & Services Update
Aug 25, 2026 - As a business owner and leader, taking the mental health of your employees seriously and understanding how it can impact their work is essential.
Aug 25, 2026 - Streamline how you monitor labor and equipment performance to help keep your projects moving and your margins protected.
Aug 25, 2026 - The Lockformer Vulcan Fiber Laser Elite Cutting System and Iowa Precision Coil Feed NEO combine into one automated, coil-fed cutting system built for faster, safer, more precise HVAC fabrication.