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  Packless Silencers/Attenuators  
       
 
Application

Packless attenuators contain no absorptive fill or media of any kind. Units are available in three models for traditional applications requiring broad band noise reduction. Performance data is provided for three basic lengths - 36”, 72”, and 108”. Contact AeroSonics for other silencer lengths.

Model APHP: Standard pressure drop unit ideally suited for low velocity systems.

Model APMP: Provides excellent attenuation values along with a moderate pressure drop at somewhat higher air velocities.

Model APLP: Offers the lowest pressure drop for higher velocity systems.

Special features of our Standard Attenuators are:
  • No acoustic fill, scrim cloth, or other media
  • Bellmouth entrance to help minimize
    turbulence
  • Tuned perforated resonant chambers to
    achieve broad-band attenuation
  • 22 gauge galvanized steel casings
  • 24 gauge perforated galvanized baffles
  • Seams are mastic filled to insure airtight units
    to 8” w.g.
Components are also available in stainless steel.

Acoustical performance ratings are based on tests conducted by Intertek Testing Services, formerly ETL Testing Laboratories, Inc., Cortland, New York, in accordance with ASTM E477 “Standard Method of Testing Duct Liner Materials and Prefabricated Silencers for Acoustical and Airflow Performance.” Copies of the test reports are available upon request.

 
Model Description Performance
Data
Submittals
APHP Standard pressure drop unit ideally suited for low velocity systems.
APMP Provides excellent attenuation values along with a moderate pressure drop at somewhat higher air velocities.
APLP Offers the lowest pressure drop for higher velocity systems.