Why are my window fans louder with the bedroom door closed?

[CookingWithGas]

I was in a similar sub-discussionin a thread about whole-house fans, where it was said:

@Khendrask

That is backwards. A normal fan, or centrifugal pump only draws current as it is moving the working fluid. Block off the intake, and the motor current will drop as no work is being done. The most common example of this is a shop vac. Block the inlet hose, the motor speeds up, as it isn’t delivering torque to moving any air.