I've just framed around the I-beam and I plan on installing closet doors just in front of it because the doors are for an opening measuring 78 1/4 - 78 3/4. The height of the beam is approximately 69". There will be four bi-folding doors installed and each pair will be 72" wide with a small dividing wall in between.
Now I need to close in my ductwork and put in a frame for the closet doors. What is the best way to do this? Ideally I'd like to come straight out from the beam and up to the joist, but this would pose a problem when trying to secure the closet door rails when the studs are spaced 16" on center.