Sonicbar® Sound Control Doors and Windows

When using sound retarding doors, the nature of the job determines whether an STC (Sound Transmission Class) rating alone is sufficient or whether more precise information is needed to establish minimum criteria.  If your project involves speech related noise control such as TV, radio, music, and other similar sources, the STC is appropriate.

When your application involves complex noise spectra such as machinery, industrial process sounds, transformers, motor vehicle and aircraft sound sources; it is best to use detailed transmission loss values at specified critical frequencies, such as single or third octaves, or other peak noise frequencies.  An acoustical consulting firm can advise the best solution to meet your specific requirements.


  • Hinged/Swinging
  • Vertical Lift
  • Horizontal Slide
  • Noise Control Hatches
  • Sound Windows
  • Sound Seals
  • Noise Control Panels

Importance of Sonicbar® Seals:

Sealing of the door's perimeter is most important in obtaining good sound attenuation.  Sealing devices should always be specified as adjustable to assure continuing "on-the-job" performance.  Although flush sills closed by an automatic threshold closure are more popular, a low sill provides a better noise barrier, and the raised sill is the best performer if its' relative inconvenience can be tolerated.  Highest door ratings are achieved by using a raised sill and four-sided frame seal. The ratings of doors tested with raised sills will be from 3 to 8 higher than doors tested with a flush sill and automatic bottom closure.  For hinged doors, compression type gaskets are preferred for reliability and long life.  For horizontal and vertical sliding doors, wiper seals experience excessive wear and may interfere with door motion.  For these doors, active compression type seals are recommended.  Optional Sonicbar® Auto Air seals are air actuated to move and seal against the door with instant spring return to prevent excessive wear.

Sound Door Selection:

Sonicbar® Sound Retarding Doors are available in a broad range of sizes, ratings, and operational configurations - hinged, vertical lift and horizontal sliding.  See the selection chart for various types of door configurations.

Sound Retarding Windows

Window designs are available in single or multiple glazed and dual framed units. Units are tested at Riverbank Laboratories per ASTM E90 with ratings from 36 to 61 STC. (Higher rating are achieved by combinations of tested units.) Multiple glazed units include desiccant systems for moisture protection when required. Fixed or hinged lite designs, sloped panes for reflection control are also available.


Sonicbar® sound retarding door models are tested by Riverbank Acoustical Laboratories according to ASTM standards. Copies of these reports are available.