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  Single & Double Wall Silencers/Attenuators  
       
 
Application

Models ARA and ARB are single wall units that
provide an economical solution to less severe
noise problems. Standard unit length is three times
the diameter, minimum 48.”

Models ADRA, ADRB, and ADRC provide improved
performance by adding a double wall casing. Unit
width is diameter plus 6”. Standard unit length is two
times the diameter, minimum 36,” plus 2” long collar
on each end.

Special features of standard tubular attenuators
include:
  • Radius spun inlet nose on center absorber to provide minimum pressure drop
  • Available in one inch diameter increments from 10” - 22” and 2” diameter increments from 24” - 60”.
  • SMACNA galvanized steel gauges for RA and RB casings
  • DR 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 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
ARA Have a single wall casing with an insulated internal baffle.  
ARB Have a single wall casing with an insulated internal baffle.  
ADRA Double wall casing with an internal baffle. Outside diameter is 6” larger than the inside diameter.
ADRB Double wall casing with an internal baffle. Outside diameter is 6” larger than the inside diameter.
ADRC Double wall casing with an internal baffle. Outside diameter is 6” larger than the inside diameter.