HVAC Branch Run Installation

Installed a 6-inch round metal HVAC branch run, cutting into an existing trunk with a tab collar and extending approximately 35 feet to an undercabinet supply vent. Secured duct with straps and aligned joints for proper airflow, with work reviewed and approved by supervisor.

In early 2026, I installed a 6-inch round metal branch duct to supply additional heat to a kitchen through an undercabinet vent. The project required cutting into the end of the existing main trunk line and running approximately 35 feet of new ductwork. The goal was to increase warmth in the kitchen by extending conditioned air from the primary supply system. This task introduced me to basic sheet metal duct modification and airflow routing.

I cut the opening in the main trunk using tin snips and installed a tab collar to create a secure branch connection. This was my first time cutting into an existing duct run and fitting a tab collar, which required careful measurement and controlled cuts to avoid deforming the trunk line. Ensuring a tight, properly seated collar was critical for airflow direction and mechanical stability.

The 6-inch round metal duct was then run approximately 35 feet to the undercabinet vent location. Proper alignment of duct sections required multiple adjustments to achieve the correct angles and maintain consistent airflow direction. The joints had to be positioned carefully to avoid unnecessary resistance or misalignment across the run.

The branch was supported using metal straps to prevent sagging and ensure structural stability along its length. Maintaining consistent support spacing helped prevent long-term movement or stress on the collar connection. The undercabinet vent was installed to deliver direct warm air into the kitchen area.

Although this was a single branch extension, it strengthened my understanding of mechanical distribution systems and how branch runs affect airflow. My supervisor reviewed the completed installation and confirmed that it was properly aligned and securely installed. This project demonstrates my ability to follow system logic, cut into existing mechanical systems carefully, and complete branch routing under supervision.