Rectangular straight attenuator Smoke single compartment Technical data lindab | fire & smoke SLRSS2 Surroundings Inlet Lw i Outlet Lw o Room Supply Lw o Extract Lw i The flow noise and pressure loss is dependent on the velo- city (v) on the face area(A) of the attenuator. However, the noise generated at the inlet of the attenuator Lw i is higher than the noise generated at the outlet of the attenuator Lw o . It is therefore crucial to use the correct value depend on the placement of the attenuator in the duct system, cf. drawing. When calculating the attenuator for: • supply and outlet - use outlet noise Lw o • inlet and exhaust - use inlet noise Lw i dB (A) dB (A) s=50 mm Sound power level, inlet: Lw i 60 0 m 100 mm 50 mm s=5 s= s=1 50 s=200 mm 40 30 20 A [m²] 0,5 0,6 0,7 0,8 0,9 1,0 2,0 3,0 4,0 5,0 Kor. -3 -2 -2 -1 0 2 3 5 6 7 10 0 0 2 4 6 8 10 12 m/s Sound power level, outlet: Lw o 50 45 40 35 30 25 20 15 10 5 0 0 s=100 msm=150 msm=200 mm A [m²] 0,5 0,6 0,7 0,8 0,9 1,0 2,0 3,0 4,0 5,0 Kor. -3 -2 -2 -1 0 2 3 5 6 7 2 4 6 8 10 12 m/s Lindab reserves the right to make changes without prior notice 2 2021-11-04
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