Fans are a new mechanic introduced in Chapter 2: The Hospital and only appear in two levels beyond the Hospital (7-7 and 7-7X). They push Meat Boy in a certain direction and will kill him if he reaches too close. Fans are almost universally despised among players due to their finicky nature and the fact that they are also hazardous to touch.

Often characters like Jill will make levels with vertical fans somewhat easier (as it is easy to make to get close to the fans without dying and she is more tolerant to mistakes like missing the fans).