Low Frequency Hospital/Clean Room attenuators are available in three models, specifically engineered for sensitive area applications requiring increased 2nd and 3rd octave band noise reduction coupled with erosion proof acoustic fill. Performance data is provided for four basic lengths - 36”, 60”, 84”, and 120”. Units are also offered in 48”, 72”, and 96” lengths.
Model ALSPC: Low frequency hospital grade unit providing excellent attenuation for system velocities in the range of 0-500 FPM.
Model ALMSPC: Provides high attenuation values along with a moderate pressure drop in systems operating at 250-750 FPM.
Model ALMPC: Provides good attenuation values along with a moderate pressure drop for systems operating at 500-1000 FPM.
Model ALMLPC: Provides a low pressure drop for systems operating at 750-1250 FPM.
Model ALLPC: Provides an excellent pressure drop for systems operating at 1000-1500 FPM.
Special features of our Standard Attenuators are:
ASTM E-84 ratings for the acoustical fill are:
- Diffusion angle to improve pressure drop
- Bellmouth entrance to help minimize
- 22 gauge galvanized steel casings
- 24 gauge perforated galvanized baffles
- Acoustic fill encapsulated in polyethylene to
eliminate erosion and absorption of gases
- Acoustic stand-off between the perforated
baffle and the acoustic fill to enhance
- Seams are mastic filled to insure airtight units
to 8” w.g.
- Flamespread 0
- Smoke Developed 15
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.