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  Standard Rectangular Silencer/Sound Attenuator  
       
 
Application

Standard attenuators are available in three models for traditional applications requiring broad band noise reduction. Performance data is provided for four basic lengths - 36”, 60”, 84”, and 120”. Units are also offered in 48”, 72”, and 96” lengths.

Model AHP: Standard unit providing excellent attenuation for system velocities in the range of 500-1000 FPM.

Model AMHP: Provides high attenuation values along with a moderate pressure drop in systems operating at 750-1250 FPM.

Model AMP: Provides good attenuation values along with a moderate pressure drop for systems operating at 1000-1500 FPM.

Model AMLP: Provides a low pressure drop for systems operating at 1250-1750 FPM.

Model ALP: Provides an excellent pressure drop for systems operating at 1500-2000 FPM.

Special features of our Standard Attenuators are:
  • Diffusion angle to improve pressure drop
  • Bellmouth entrance to help minimize turbulence
  • 22 gauge galvanized steel casings
  • 24 gauge perforated galvanized baffles
  • Long strand Fiberglass acoustical fill
  • Seams are mastic filled to insure airtight units to 8” w.g.
  • Optional polyethylene, Mylar or fiberglass cloth liners
ASTM E-84 ratings for the acoustical fill are:
  • Flamespread 10
  • Smoke Developed 10

Components are also available in stainless steel or aluminum construction.

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
Fiberglass
Fill
Mold
Resistant
AHP Standard unit providing excellent attenuation for system velocities in the range of 
500-1000 FPM
.
AMHP Provides high attenuation values along with a moderate pressure drop in systems operating at
750-1250 FPM.
AMP Provides good attenuation values along with a moderate pressure drop for systems operating at 
1000-1500 FPM
.
AMLP Provides a low pressure drop for systems operating at 
1250-1750 FPM
.
ALP Provides an excellent pressure drop for systems operating at 1500-2000 FPM.