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Low Frequency Tubular Attenuators
     
 
Application

Models LRA, LRB, and LRC provide improved LOW FREQUENCY performance to solve the toughest noise
problems. Unit width is diameter plus 16”. Standard unit length is two times the diameter, minimum 36,”
plus 2” long collars on each end.

Special features of the LOW FREQUENCY tubular attenuators include:

  • Radius spun inlet note on center
    absorber to provide minimum
    pressure drop
  • Available in one inch diameter increments from
    10” - 22” and 2” diameter increments from
    24” - 60”.
  • LR model casings:
  • 12” - 24” diameter - 22 ga. galvanized steel
  • 26” - 60” diameter - 18 ga. galvanized steel
  • 24 gauge perforated galvanized baffles
  • Long strand Fiberglass acoustical fill
  • Seams are roll formed and 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 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
LRA Double wall casing with an internal baffle. The outside diameter is 16” larger than the inside diameter.
LRB

Double wall casing with an internal baffle. The outside diameter is 16” larger than the inside diameter.

LRC Double wall casing with an internal baffle. The outside diameter is 16” larger than the inside diameter.
     

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