carb air box exhaust tube

[46cubpilot]

I've noticed that a lot of the old planes (pre '50s) that used the little Continentals use a carburetor air box with an exhaust tube that sticks out of the bottom of the cowling. Why? Was it to just get the heated air to exhaust outside the cowling? Sounds like a good idea. But why did it fall out of favor. It seems that most planes from the early '50s on just dump the heated air for the carb into the lower cowl.
Also, am I being too hard nosed when I make people install the proper air box, with an exhaust, when I annual their airplanes? That IS the way they were designed. And it is what is in the TC.

 

[huston marlowe]

 

[JimC]

 

[bob turner]

 

[huston marlowe]

 

[JimC]

 

[bob turner]

 

[JimC]

 

[J5man]

 

[JimC]