Spiral Manufacturing is a leading supplier of PVS-coated underground duct and pipe, offering superior protection against corrosion and the harsh conditions of underground environments. Our insulated metal HVAC ductwork is specifically designed to provide reliable performance and long-lasting durability, even in the most demanding applications. Ideal for both residential and commercial projects, our underground ducting solutions ensure efficient air distribution while safeguarding against environmental factors like moisture and temperature fluctuations. With a focus on quality and innovation, Spiral Manufacturing delivers HVAC ducting that meets the highest standards of performance and reliability. Trust us for your underground ducting needs.