A branch duct is a smaller pipe or flexible duct that splits off from the main "trunk" line to deliver conditioned air to individual rooms. These are the final segments of the distribution system that connect directly to the registers and grilles in your ceiling or floor. In Mobile Home applications, branch ducts must be carefully sized to ensure that the room furthest from the furnace receives adequate airflow. Using high-quality Flex Duct for branch lines can simplify installation in tight spaces while providing excellent insulation. If a branch duct is kinked or disconnected, you will experience "hot spots" or "cold spots" in specific areas of your home. Many homeowners use Duct Booster Fans to help move air through particularly long or complex branch runs. Ensuring these ducts are airtight and properly insulated is one of the best ways to improve the performance of your Ducted Shop All heating and cooling system.