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I don't have an answer for the CFM question and unlike the CI capacity of the compressor question, if there is a volunteer that has one of the factory AC cars willing to help out a fairly accurate CFM number would be easy to find using an inexpensive anemometer and a few minutes of time.

Amazon has several handheld units that would do the job. I bought one for less than $20 when wanting to design components and optimize air flow to the additional front AC outlet I installed when building my modern component repro version of a prewar AC unit for the 47.

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Hi Howard,

Happy New Year to you.

Your installation of another AC vent for your '47 reminds me of the Cardinal Rule of AC:

A friend who worked for GM-Frigidaire, who was involved in the up-front, first year 1955 Chevrolet AC system asked me if I knew the answer:

The first rule of automotive AC is AIRFLOW, not the cool air temperature from the vent.

An aside: Occasionally, his GM-Frigidaire team needed to share the wind tunnel facilities of the Harrison Radiator Group.

Major deal, as they were independent of each other and were fiercely secretive as well. Remember, Harrison won the contract for the 1954 Pontiac up-front AC system, as Frigidaire declined. He recalled reserving the wind tunnel, and remembered each team completely ignored each other, and spoke not a word.

There's always another car story...

archiveman2977
Allen