The 1949 i am getting today has a chrome grill and is a 5 window cab. On the heater under the dash it says "deluxe".
That's not the "Fresh Air" heater, This is what a
Fresh Air heater looks like, notice it does not say "Deluxe"
This heater has the
Deluxe tag, not sure if it's the same.
Here's another
Deluxe heater 
