Of course it supposed to be located in a sound-proof room.
So that, when we get annoyed of something..
We can just go in to the so called 'happy room' and punch , kick, hug or anything you want to do with the punching bag.
Wouldn't it release the stress?
Not only to cope with the stress, it also can be treated as an exercise.
See, the multi purpose of the punching bag.
I wish I could have one now.
That is a 'sweet' evil grin.
Images are google ed.