Rectangular sound attenuator in galvanised steel Application The sound attenuators are used to absorb the noise in air conditioning or ventilation ducts Composition Casing in galvanized steel, thickness 1,0 mm Metu flange 30 mm up to 6,0 m of perimeter or flange 40 mm over 6,1 m of perimeter Acoustic baffles with casing in galvanized steel thickness 0,6 mm (baffles 200 mm thick), thickness 0,8mm for other baffles Acoustic material in mineral wool 60Kg /m³ with protection against erosion by glass fibre, fire resistance M0 and non combustible material used in A,B and C class in accordance council directive 96/98/EC on Marine Equipment (Rina) Acoustic data tested in accordance to ISO 11691 (test report N°142976) Pressure loss data tested in accordance to ISO 7244 (test report N° 136363) Noise of sound attenuator tested in accordance to ISO 23741 (test report N° 149877) BTC-A : with baffles totally in protected mineral wool, suitable to absorb the noise at medium high frequencies (250÷8k Hz) BTC-O : with baffles half covered with galvanized steel, suitable to absorb the noise at low frequence (125 Hz) (on request with galvanized plate with perforated stripes) Baffles thickness 100,200,300 mm with possibility of aerodynamic profile Extended metal sheet protection for acoustic material Plastic and extended metal sheet protection for acoustic material, especially for hospital, pharmaceutic or microelectronic industries Mounting Duct Mounted Options Other glass fibre protection available Casing in stainless steel on request Order example (QTY)=1no (Dimensions W X H X L)=600mm x 300mm x 1500mm Long (Model)=BTC (Description)=Rectangular Silencer (Accesories)=With Duct Flanges V : speed referred to the sections BxH [m/s] ∆pt : total pressure drop [Pa] LwA : sound power level weight A [dB(A)] 200/100 : baffle thickness / distance between baffles; rapport between free area / total area = 33% 200/150 : baffle thickness / distance between baffles; rapport between free area / total area = 43% 200/200 : baffle thickness / distance between baffles; rapport between free area / total area = 50%
