This air handler was like this from factory. It is not like it is the one that slipped out the door on accident or something we have others just like it.
Notice the frame notched out to fit the motor. It must run B42 belts. Try B43s and you can't pretend to get it tight the motor is in the frame. B41s and you cannot even roll it on because the sheaves are crammed so hard together.
Belts are tight after the front of the unit had a hole drilled through it and the motor mount so a bolt could be put in it to pull it tight.
Mickey mouse motor mount has no adjuster or even a place to pry to get the belts tight. The motor could not be 1/4" bigger in any direction or it wouldn't work.
System has been one failure after another even with continuous maintenance. It is irritating because it looks bad on the company when manufacturers make "commercial" equipment like this. I believe my drunk pot smoking brick laying neighbor could build a better air handler out of a riding lawnmower. Ok well maybe not but sometimes you look at this stuff and think wtf were they thinking?