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In the past, terminal boxes and the ducts were separated from the room by a thick ceilings. These ceilings prevent the noise from the radiating into the room. Plaster and taped plasterboard ceilings examples thick ceilings. Modern architectural practice is to use simple (and inexpensive) decorative suspended ceilings. These ceilings are not thick. They have only half of resistance to the transmission of noise that plaster and plasterboard ceilings. Exposed tee-bar grid ceilings, 2 X 4 fiberglass pads and perforated metal tray ceilings examples. The end result is readily apparent. Housing noise in light of modern buildings is a problem.
Terminal boxes can sometimes be located in the busy areas (corridors, toilets, machine-equipment of rooms), not more quiet areas. In quiet areas, housing noise can penetrate the ceiling and become unacceptable. Housing built around the terminal box (for example, gypsum plasterboard or sheet lead through the glass-fiber blanket, wrapped around the box) can reduce the noise to an acceptable level.
However, this method is time consuming and restricts access to the engine and volume controllers in the window. It depends on the field for satisfactory operation and expensive. Limitation of static pressure in branch ducts minimizes noise casing. This method, however, limits the flexibility of terminal-box systems. It is unlikely that he classifies as a control..
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