Hello, I'm remodeling my basement and have a 8x12 duct running right down the middle of the room splitting the room in two. I'm wanting to somehow replace this 8x12 and give myself more ceiling height. This is on a forced air furnace and this duct supplies 6 registers: 2 for the basement, and 4 upstairs.
What are my options? I really would rather not re route everything to the outside walls if I can help it.