Necessary to have ducts tight to underside of joists? I've shown airspace between duct/joist
joist- stop at bearing wall, or show overlapping bearing wall a little bit?
Plenum depth: 32x24 duct max size at floor/clg first floor, I've shown 32" total depth for plenum (24" plus 8") below joist- beneficial to add inch or two in depth for 'wiggle' room or is minimum clearance fine?
Thanks in advance