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  Elbow Silencers/Attenuators  
       
 
Application

Elbow attenuators are available in three models for horizontal or vertical applications requiring broad band noise reduction when space for straight attenuators is not available. Performance data is provided for eight centerline lengths - 36”, 48”, 60”, 72”, 84”, 96”, 108”, and 120”. Special centerline lengths are available, upon request.

Do not use Elbow Attenuators when space permits the use of straight rectangular units. Follow the same location guidelines as rectangular attenuators.

Model AEHP: Standard pressure drop unit ideally suited for system velocities at 500 to 1,000 fpm.

Model AEMHP: Provides attenuation values along with a moderate pressure drop that falls in between the performance characteristics of the EHP and EMP models

Model AEMP: Provides excellent attenuation values along with a moderate pressure drop at velocities from 1,000 to 1,500 fpm.

Model AEMLP: Provides attenuation values along with a moderate pressure drop that falls in between the performance characteristics of the EMP and ELP models.

Model AELP: Offers the lowest pressure drop for velocities above 1,500 fpm.

Special features of our Standard Attenuators are:
  • 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 independent tests of a 24” x 24” attenuator conducted by Intertek Testing Services, following general guidelines prescribed by ASTM E477-96 and pending guidelines being developed specifically for Elbow Attenuators. Copies of the test reports are available upon request.

 
Model Description Performance
Data
Submittals
Fiberglass
Fill
Mold
Resistant
AEHP Standard pressure drop unit ideally suited for system velocities at 
500 to 1,000 fpm.
AEMHP Provides attenuation values along with a moderate pressure drop that falls in between the performance characteristics of the EHP and EMP models
AEMP Provides excellent attenuation values along with a moderate pressure drop at velocities from
1,000 to 1,500 fpm.
AEMLP Provides attenuation values along with a moderate pressure drop that falls in between the performance characteristics of the EMP and ELP models.
AELP Offers the lowest pressure drop for velocities above 1,500 fpm.