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There are two types of noise in architectural acoustics: airborne and structurally transmitted. If people are screaming as they run down the hall, the screaming is mostly airborne noise and the running is mostly structurally transmitted noise. Airborne noise can be attenuated by constructing walls, floors, ceilings, doors, etc. to absorb sound energy. ...


Do NOT attempt to make any modification to a common hallway door without at least consulting your local fire marshal. It is very likely that is it legally required to be fire rated, and your modifications very likely invalidate that rating. If there is a fire in your building, and investigation reveals that you modified your door, you could be held liable ...

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