PVS 45˚ Lateral Tees

Reliable PVS Branch Fittings and Underground Pipe Systems for HVAC Efficiency

At Spiral Manufacturing Co., Inc., we focus on engineering and fabricating HVAC and underground air components that deliver reliable results in every application. Powered by innovation and a passion for reliability, we offer a wide range of specialty duct products that enhance smooth airflow, structural strength, and long system life. A few of our featured product lines are PVS lateral tees and underground pipe systems—precision-engineered products that meet the evolving requirements of underground HVAC applications with optimal efficiency and ease of installation.

Resilient PVS Systems for Underground HVAC Infrastructure

Our PVS underground pipe systems are designed for strength, moisture resistance, and long-term stability in below-grade environments. Manufactured using industrial-grade polyvinyl steel, these pipes offer a robust yet lightweight alternative to traditional metal ducting. PVS material possesses corrosion and weather-resistance capabilities and permits high-velocity airflow with reduced friction loss. This makes them an ideal pick for ventilation and exhaust systems requiring routing underground. PVS lateral tees complement this system with simple, airtight branching from main duct lines at convenient angles. In distributing air to multiple zones or carrying return air back to centralized systems, lateral tees simplify the setup of complex underground duct networks.

Built to Withstand Underground HVAC Conditions

Underground HVAC systems present unique challenges, including moisture infiltration, soil pressure, and long-term material fatigue. Our PVS underground pipe solutions are built specifically to address these concerns. Each component undergoes rigorous testing to ensure resistance to water intrusion, mechanical stress, and performance degradation over time. These products are ideal for:

These solutions are widely used in:

• Underground return air and supply lines
• Commercial and institutional HVAC applications
• Industrial exhaust and environmental control systems

In combination with our PVS Lateral Tees, these systems provide designers and contractors the flexibility to create efficient, code-compliant layouts that are both cost-effective and easy to install.

Minimizing Maintenance Through Superior Engineering

When designing underground ductwork systems, long-term performance is critical. Our products are fabricated with attention to tight tolerances and consistent fitment, ensuring secure connections and minimal airflow loss. The smooth interior surface of the PVS underground pipe supports clean air passage, reduces noise, and lowers energy consumption. Combined with the aerodynamic design of our PVS lateral tees, the result is a system that minimizes maintenance and delivers consistent performance over its service life. Contractors also benefit from reduced installation time due to the lightweight nature of PVS components, which simplifies handling and placement in constrained underground spaces. Whether you’re working on a retrofit project or new construction, our solutions offer practical advantages that translate into real-world value.

Engineered for Long-Term Performance and Efficient Installation

Every product we manufacture is backed by our decades of expertise in HVAC ductwork fabrication and system integration. From material selection to final inspection, we prioritize precision, safety, and compliance with industry standards. Our solutions are engineered to support environmentally responsible building practices and long-term mechanical system efficiency. We collaborate closely with contractors, engineers, and project planners to deliver custom configurations when needed, ensuring each system is tailored to site-specific challenges. Our commitment to quality craftsmanship and responsive customer support has earned us a strong reputation across a variety of commercial and industrial markets.

Innovative Duct System Solutions for Underground Applications

At Spiral Manufacturing Co., Inc., we take pride in being a trusted leader in advanced duct system solutions, delivering dependable and high-performing products tailored for underground HVAC applications. We understand the demands of modern infrastructure and engineer our PVS lateral tees and underground pipe systems to exceed expectations in performance, durability, and longevity. With decades of experience in precision fabrication, we ensure every component meets stringent quality standards for air movement and environmental control.

To learn more or request a product consultation, contact our team today—we’re here to support your project every step of the way.