You get a slight odor, but with the amount of air the booth pulls through, is rarely lingers.
A window is opened just to the left of the air handler to make up the air exiting. The booth is on the opposite end of the building, the air handler is set to constant fan and the heater is aimed at it to put heat at that end of the building (vents in ceiling, as are booth filters) first before the cold air from outside gets there.. It seems to keep the entire building warm except for directly in front of the open window. You can actually step in the booth and it feels warmer..