I'm getting some weird results from the current eQuest 3.64 model I'm
running.

14 story office building, parallel FP terminals (using PIU system).
Plenums have been modeled, although usually I leave them out.

Two things are happening:

1) If I let eQuest autosize the systems, the fan CFM are
outrageous. On the order of 10 CFM per sq ft. If I put in a design CFM
(closer to 1 CFM per sq ft), the results are more consistent with what I
expect, but there are no unmet load hours either. So why the heck is
eQuest oversizing the fan systems?

2) I can't "force" the return air path to be anything other than
"Plenum Zones". Even if I change it to duct or direct, after running
eQuest, I go back in to the model and the system I changed has reverted
back to plenum zones.

Has anyone ever seen this issue before?

Unfortunately I can't send out inp and pd2 files, sorry!

James Hansen, PE, LEED AP