What is the name of the machine used to destroy doors in Monsters, Inc.?

The machine used to destroy doors in Monsters, Inc. is called the door shredder. It is used by Monsters, Incorporated to eliminate bedroom doors after they have been judged unsafe or contaminated.

The device becomes especially important near the end of the film, when Sulley and Mike try to protect Boo from Randall and the factory authorities. A door entering the shredder represents the apparent loss of a route back to a child’s bedroom. Sulley’s determination to recover Boo’s door turns the machine into one of the film’s major suspense points.

The door shredder is separate from the machine used in the illegal scream-extraction plot. Randall’s extraction device is designed to force screams from children, while the shredder physically destroys doors. Confusing those two machines changes the answer.