Acoustic Ceiling


ACOUSTIC CEILINGS

There are the simple acoustical tile ceilings that surround the lighting fixtures, duct outlets, etc., and conceal unsightly ductwork, piping and electrical work. The acoustical tile reduces the reflected noise within the room, but does virtually nothing to reduce sound transmission from above. It does not prevent noise within the room traveling upward or over partition walls that are not floor to structural ceiling.
A sound barrier ceiling is entirely different. Originally, they were all plaster on lathe and still are occasionally for curved or artistic finishes. Today two layers of 1/2” (1 3mm) or 5/8” (1 6mm) gypsum board are the most common sound barriers. They have significant mass, joints are staggered and all edges and openings are sealed. Fiberglass bats lying on the ceiling help as well. An isolated gypsum barrier ceiling can lower the noises from above by anywhere from 1 0 to 1 5db, depending on the air gap, the weight of the ceiling and the quality of the isolation hangers.
In many situations there is a barrier ceiling and a mechanical ceiling below it. Piping, ducting and electrical services are usually located between the two, because it is both costly and difficult to break through the gypsum.
Some companies place a rubber element on top of the spring to reduce sound transmission. Spring stability depends on the nut against a hard surface to keep the top and bottom coils parallel. Any rubber element on top would have to be rock hard or it would not provide that stability. A hard mounting serves no purpose so we depend on the LDS rubber spring cup and it keeps the profile shorter.



HD Neoprene Hangers offer the same increase static deflection and vibration control n a sturdy steel hanger box.

HD HANGER INSTALLATION: Install hangers with gap on underside as shown. This allows the isolators to operate efficiently. The gaps also compensate for minor misalignment. Direct contact of the unit and hanger box "short circuits" the isolation.

When suspending equipment from very wide vibration sensitive spans it may be necessary to select spring hangers with even higher deflections in order to cancel the effects of the span's own deflection or "sag". The isolator selected must have a static deflection at least three times grater than the span's deflection to insure minimum effective vibration control.







HD Double Deflection Neoprene Hangers


HD Neoprene Hangers offer the same increase static deflection and vibration control as ND mounts but in a sturdy steel hanger box.
HD HANGER INSTALLATION: Install hangers with gap on underside as shown. This allows the isolators to operate efficiently. The gaps also compensates for minor misalignment. Direct contact of the unit and hanger box “short circuits” the isolation.
When suspending equipment from very wide vibration sensitive spans it may be necessary to select spring hangers with even higher deflections in order to cancel the effects of the span's own deflection or “sag”. The isolator selected must have a static deflection at least three times grater than the span’s deflection to insure minimum effective vibration control.

WHD – All box type spring hangers are available with eyebolts top and bottom and precompressed from the factory.HD hangers perform the best when used on equipment located adjacent to stiff support walls and columns, and suspended from narrow rigid upper building spans.






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