Some fixtures, accessories, and mechanical equipment can be inserted in line with existing duct segments, automatically making connections where they are placed. These break-into components have identical opposing connectors that are perfectly aligned with the direction of their connectors. Transitions are automatically inserted when it is necessary to match the size of the duct segment.
When the size of a break-into component matches the duct size where it is placed (no transitions), the break-into behavior restores (heals) the duct segment if the component is removed. The following example adds a damper to existing ductwork.