I'm a home inspector and I'm seeing this more often. Essentially, there's a distribution branch run off of the main plenum of a forced air unit. This branch is then split into two (a "Y") without the use of a "triangle" junction box, AND the split is NOT equal in size (one large branch, and one small). Then further down the larger branch, there's another split without a junction box (again one large, and one even smaller branch). Many of my customers who complain of poor airflow have this configuration. Is this type of thing proper, and if not, what is a better configuration. I would think that no branching would be best. Any help appreciated.