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  Packless Attenuators for Round Ductwork  
       
 
Application

These in-line tubular packless (no acoustic fill) attenuators are available in two models for special applications requiring broad band noise reduction.
Performance data is provided for three basic diameters – 8”, 12”, and 16” Model ARPS provides excellent attenuation values with a moderate pressure drop for system velocities at or near 1000 fpm. Model ARPL is a low-pressure drop unit ideally suited for higher velocities at or near 2,000 fpm.

Special features of the Packless Fume Hood Attenuators are:
  • No acoustic fill or other sound absorptive material
  • 22 gauge galvanized steel casings
  • 24 gauge perforated galvanized baffle
  • Seams are mastic filled to insure airtight
    units to 8” w.g.
  • 21” x 21” casing on 8” and 12” diameter units.
    30” x 30” casing on 16” diameter units.

Components also available in stainless steel

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.

Elbow Type

These elbow type tubular packless (no acoustic fill) attenuators are available for special applications requiring broad band noise reduction. Performance
data is provided for three basic diameters – 8”, 12”, and 16”

Model AREPL is a low-pressure drop unit ideally suited for all applications

Special features of the Packless Fume Hood Attenuators are:
  • No acoustic fill or other sound absorptive material
  • 22 gauge galvanized steel casings
  • 24 gauge perforated galvanized baffle
  • Seams are mastic filled to insure airtight
    units to 8” w.g.
  • 21” x 21” casing on 8” and 12” diameter units.
    30” x 30” casing on 16” diameter units.
Components also available in stainless steel

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
ARPS Provides excellent attenuation values with a moderate pressure drop for system velocities at or near
1000 fpm.
ARPL A low-pressure drop unit ideally suited for higher velocities at or near
2,000 fpm.
AREPL
(elbow)
An elbow type low-pressure drop unit ideally suited for all applications.