A somewhat similar in appearance Airflow (Air Flow) or Fresh-Air Heater was available as a GM Accessory from 1947-1955 (A-D years). They all used outside air from that that lower right cowl opening.
In 1953-55, the cable controlled inside/outside air and from 47-52 the cable controlled the defroster flap.
GM's use of the terms Air Flow and Fresh Air over 47-55 is confusing and not consistent with changes made in 1953.
