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Standard Rectangular Attenuators
     
 
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 HP: Standard unit providing excellent attenuation for system velocities in the range of 500-1000 FPM.

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

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

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

Model LP: 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.

Submittals
Mold
Resistant
HP Standard unit providing excellent attenuation for system velocities in the range of
500-1000 FPM
.
MHP

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

MP Provides good attenuation values along with a moderate pressure drop for systems operating at 1000-1500 FPM.
MLP Provides a low pressure drop for systems operating at
1250-1750 FPM
.
LP Provides an excellent pressure drop for systems operating at 1500-2000 FPM.
     

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