Attic Ductwork
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This duct originated in the basement, passed thru a wall made thicker to accommodate it, then ran horizontally in a kneewall. We found the roof anglethen made a 32 degree elbow to follow the roof and then a 58 degree elbow to straighten it out to lay on the coller ties.

This is duct rising from 1st floor, running thru knee wall to rise up to second floor attic

While difficult to see. The insulated duct in foreground is 1 zone running to the right while the insulated supply in rear runs to the left, with the return in the middle. One airhandler serving two zones.