In my basement, I have a bathroom of 8'X5' and next to it there is kid space of 10'X15' both sharing one wall. I don't have much space in ceiling to run 2 flex ducts in their own separate joists cavity.
Just above in the upstairs, have two bedrooms and one bath room which took almost entire ceiling space for plumbing/flex duct. so I have only one cavity left between 2 joists in the ceiling to supply air to both of these rooms/spaces.
But How ?