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Low Frequency Attenuators
     
 
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 LHP: Low frequency unit providing excellent attenuation for system velocities in the range of
0-500 FPM.

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

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

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

Model LLP: 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.

Submittals
Mold
Resistant
LHP Low frequency unit providing excellent attenuation for system velocities in the range of
0-500 FPM
.
LMHP

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

LMP Provides good attenuation values along with a moderate pressure drop for systems operating at 500-1000 FPM.
LMLP Provides a low pressure drop for systems operating at
750-1250 FPM
.
LLP Provides an excellent pressure drop for systems operating at 1000-1500 FPM.
     

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