New answers tagged vent
Exhaust fans in laundry rooms are usually required when there is no exterior window in the room and the dryer to be used heats with gas power. Why? To exhaust the CO2 CO2 in large amounts is hazardous to humans and can cause asphyxiation/death.
Given that the dryer vent pipe typically goes through the wall without any special consideration, touching the wall surface should also be fine. Unlike other combustion appliances, the dryer exhaust is diluted with a great deal of additional air. If it's hot enough to scorch your wall, it's hot enough to scorch your clothes.
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