Fluid Mechanics and Dust Collection

Anybody know the losses associated with a "T" connection vesus a "Y",
say at angle theta? I'm sure this is a standard problem in a fluid
mechanics class.

I notice the Lee Valley catalog ONLY carries the "Y". Woodcraft carries
"Y" and "T". Knowing the reputation of the Lee Valley staff, I suspect
they do not carry the "T" because of the large vacuum loss around the
sharp corner....and, therefore, refuse the sell it. Just a hunch.

I want to use "T" because they fit my layout better..but...hey it's
nice to have strong suction forces too.

.