4″ C-4 Collar – Galvanized Steel Duct Connector

The C-4 4″ Collar is a high-quality galvanized steel fitting designed to provide a secure and efficient connection in HVAC ducting systems. Engineered for use in both residential and commercial applications, this collar is an essential part of any ventilation setup that requires transitioning between round ducts and flat surfaces such as plenum boxes, boots, or panels.

Constructed from premium-grade galvanized steel, the collar offers exceptional resistance to corrosion and rust, ensuring long-lasting durability even in challenging environments. Its 4-inch diameter provides a perfect fit for standard duct sizes, promoting uninterrupted airflow and helping to maintain proper system pressure and efficiency.

The smooth, round edge and reinforced lip make installation fast and easy, while also helping to create a tight, stable seal that minimizes air leakage. The lightweight design allows for quick positioning and secure fastening, and it’s compatible with a wide range of HVAC components including flexible ducting, rigid piping, elbows, and grilles.

Thanks to its compact, efficient shape, this collar is ideal for tight spaces and installations that demand precision and reliability. Whether you’re working on new construction or retrofitting existing ductwork, the C-4 4″ Collar is an ideal solution for ensuring professional-grade performance and long-term durability.