lindab | acoustic solutions Rectangular straight silencer DLD/DLDR Pressure drop Follow the directions below and the adjoining graph. 1 Calculate the gross cross section area a × b in m². 2 Go horizontal in the graph to the present air flow, l/s. 3 Go up to the resistance number achieved from the tables on page 42 – 45. 4 Read the pressue drop over the silencer, at straight duct connection before and after the silencer, (factor 1,0). For other modes of connection see the table for correction on page 40. 5 Air flow velocity, which is used at the calculation of the self generated noise, can be read here. 200 R 150 Δ p t [Pa] 30 20 15 10 8 6 4 3 2 1,5 1 100 90 80 70 60 50 40 30 20 3 4 15 10 2 5 4 q [l/s] 3000 3 1 2000 0 5000 0 2 10000 1,5 6000 1 30040000 1 2000 500 0,5 1000 0,4 A c [m²] 1 0,3 600 0,2 300400 200 150 0,1 1 2 5 3 4 5 6 7 8 910 v [m/s] We reserve the right to make changes without prior notice 39 2017-12-11
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