Are their any clothes dryers that pull air directly from outside the dryer to go over the heating element and into the drum?

The dryers I've taken apart pull air from inside the dryer cabinet to go over the heater and into the drum. I can see that this design might be more efficient since the air inside the cabinet is pre-heated by what's going on inside. But the inside of the cabinet gets a lot of lint in it and the air inside is probably more humid that the outside air.