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CIRCULAR ABSORPTION SILENCERS WITH OR WITHOUT POD OVERVIEW TECHNICAL CHARACTERISTICS OVERVIEW: The SC series of circular silencers are basic element in any airconditioning system, as they make it possible to reduce the noise propagated in the air ducting. Various assembly systems can be used, allowing them to be used for air or smoke intake or extraction systems, ventilation for soundproof cabins, cooling circuits for generator sets, and air-conditioning and ventilation systems, as well as fitting them directly on axial fans or on outlet of centrifugal fans. SILENCERS WITH POD : These are used in all special applications, with an air flow rate that varies from a minimum of 1500 m3/h to a maximum of 360,000 m3/h. Pod, holding frame : In galvanised steel sheet. Pod, protective sheet : In micro-expanded steel sheet, to avoid delamination of the mineral fibre due to the passage of the airflow. Pod, construction system, material used, and assembly system : Designed and made with a conical shape in order to reduce the noise caused by the impact of air and dynamic losses at the intake, the pod contains a soundproofing jacket made of high density mineral fibre, that is coated externally by a film of protective glass, enclosed by a micro-expanded steel sheet. The fixing position for the pod is concentric, inside the holding frame. Pod, reaction to fire : Not inflammable - class 0. SILENCERS WITHOUT POD : These are used in all applications where the air flow rate varies from a minimum of 1500 m3/h to a maximum ofi 540,000 m3/h. CHARACTERISTICS : Silencer, outer frame : made of galvanised steel sheet. Silencer, fixing without flanges : By reinforced couplings in the circular duct. Silencer, fixing with flanges : By tightening bolts or nuts on flanges with holes on the two ends of the silencer and on the axial fan or circular duct. Silencer, fixing with collar : By tightening pressure collars between the two edges at the two ends of the silencer, and that on the circular duct fitted with an edging. Absorption baffle, holding frame : Enclosed in the cylindrical silencer with galvanised steel sheet. Absorption baffle, external holding sheet : In microexpanded sheet. Absorption baffle, material used : Jacket in high density mineral fibre, coated externally with a protective glass film. Baffle, reaction to fire : Not inflammable - class 0.

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CIRCULAR ABSORPTION SILENCERS WITHOUT POD ATTENUATION PERFORMANCE SAC SERIES ATTENUATION FOR SILENCERS EXPRESSED IN dB WITH REFERENCE TO 8 OCTAVE BANDS D x 1 SILENCER WITH A DEPTH EQUAL TO ITS DIAMETER Fitted in a ducting system Nominal diametre Other applications Frequencies in Hz 63 125 250 500 >1000 ATTENUATION FOR SILENCERS EXPRESSED IN dB WITH REFERENCE TO 8 OCTAVE BANDS D x 1,5 SILENCER DEPTH, ONE AND A HALF ITS DIAMETER Nominal diametre Other applications Frequencies in Hz 63 125 250 500 >1000 Fitted in a ducting system

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CIRCULAR ABSORPTION SILENCERS WITHOUT POD ATTENUATION PERFORMANCEATTENUATION FOR SILENCERS EXPRESSED IN dB WITH REFERENCE TO 8 OCTAVE BANDSD x 2 SILENCER WITH A DEPTH EQUAL TO TWICE ITS DIAMETER SAC SERIES Nominal diametre Other applications Frequencies in Hz 63 125 250 500 >1000 Fitted in a ducting system The attenuation values 'Fitted in a ducting system' relate to silencers fitted in a ducted plant system (duct - silencer -duct). Where silencers are positioned at the end of ducting, or fitted directly to the inlet on an axial fan or intake on an centrifugal fan, the...

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