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  Low Frequency Silencer/Sound Attenuator  
       
 
Application

Low Frequency attenuators are available in three models for specific applications requiring increased 2nd & 3rd octave 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 SRL-2: Low frequency unit providing excellent attenuation for system velocities in the range of 
0-500 FPM.

Model SRL-3: Provides high attenuation values along with a moderate pressure drop in systems operating at 250-750 FPM.

Model SRL-4: Provides good attenuation values along with a moderate pressure drop for systems operating at 
500-1000 FPM.

Model SRL-5: Provides a low pressure drop for systems operating at 750-1250 FPM.

Model SRL-6: Provides an excellent pressure drop for systems operating at 1000-1500 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
SRL-2 Low frequency unit providing excellent attenuation for system velocities in the range of 
0-500 FPM
.
SRL-3 Provides high attenuation values along with a moderate pressure drop in systems operating at
250-750 FPM
.
SRL-4 Provides good attenuation values along with a moderate pressure drop for systems operating at 
500-1000 FPM
.
SRL-5 Provides a low pressure drop for systems operating at 
750-1250 FPM
.
SRL-6 Provides an excellent pressure drop for systems operating at1000-1500 FPM.