High Temperature Stainless Steel

Spiral Manufacturing supplies high-pressure underground duct made with PVS-coated steel for underground HVAC and corrosive fume exhaust applications. The duct combines galvanized steel strength with a corrosion-resistant polyvinyl coating to help protect against soil contact, moisture, and demanding below-grade conditions. Product options include Class 1 PVS spiral pipe, fittings, connectors, and custom-made hoods for project-specific needs. The system is designed for strong underground air delivery, long-term performance, and proper installation support. Contact their team to request underground duct details for your project.