C-7 7" Collar – Galvanized Steel Duct Connector

The C-7 7" Collar is a heavy-duty galvanized steel duct connector crafted for creating secure and airtight transitions between round ductwork and flat surfaces like plenum boxes, sheet metal panels, or HVAC register boots. Engineered for reliability and performance, this 7-inch collar ensures stable airflow, minimal leakage, and enhanced system efficiency, making it a go-to choice for professional HVAC installations in residential, commercial, and industrial environments.

Constructed from zinc-coated galvanized steel, the C-7 collar is highly resistant to corrosion, moisture, and temperature extremes, ensuring long-term performance indoors or outdoors. The 7-inch diameter fits standard round ducting, and its smooth, rolled edge lip adds extra strength while protecting installers from sharp edges during handling. This thoughtful design also speeds up the installation process, especially in tight or awkward spaces.

Whether you're installing a new ventilation system, upgrading an old one, or handling a retrofit project, the C-7 collar provides a tight and reliable seal to improve air delivery and energy efficiency. Its circular structure promotes smooth airflow with minimal turbulence or pressure drop, supporting quieter and more effective HVAC operation. Lightweight yet rigid, it can be secured using screws, HVAC tape, or sealants depending on your setup's needs.

In applications where airtight performance, resilience, and ease of installation are essential, the C-7 7" Galvanized Steel Collar stands out as a dependable solution for consistent ductwork performance.