Air Conditioner question

When the Coleman Mach A/C in my class C is running in the cool high/low position does it pull outside air into the coach, or does it circulate the air. Also when in the fan position does it pull in outside Air? I'm asking because we are going to riding and camping in the 4 corners area and there could be smoke from the forest fires north of there. My owners manual wasn't much help. It's a Coleman Mach 3 #48253c966.