Hi everyone,
I work for a small custom Display Case Mfr. Last week, we had an issue in the field with too much air overloading a unit and it has me thinking that in some instances, fan choice may have been just a guess based on a previous design. Simply put, an educated guess. We haven’t made that particular sized case since 2010 so I don’t have recent history to refer to.

In determining the proper airflow over the evaporator is there a way to come up with the best fan choices? When I was in in the field as a service tech I would look for a 10°f differential across the coil and call it a day.

I realize that airflow is probably the most complex issue in a display case especially open type air-curtains. However I believe this site has the brightest minds around and I just may find some little thing that leads to learning something new. (and I'm not just blowing smoke)

As always thanks for your input.