Diffuser Technical data Air flow, q [l/s] and [m³/h], total pressure drop, Δ p t [Pa], throw length, l 0,2 [m], and A-weighted sound power level, L WA [dB], for different settings, n [number of open rows], are shown in the graph. The setting is made by sealing off rows of holes with tape on the front's inside. Sound power level, L Wok [dB], in octave bands is calculated as L WA + K ok . K ok is found in the table below. Ød Diffuser Centre frequency nom mounted in [Hz] 63 125 250 500 1K 2K 4K 8K 100 Duct -2 -2 -1 1 0 -4 -13 -14 125 Duct -4 -4 -3 -2 -2 -2 -1 -7 Sound attenuation, Δ L, [dB] Ød Diffuser n Centre frequency nom mounted [Hz] in 63 125 250 500 1K 2K 4K 8K 14 14 14 9 4 0 1 1 3 100 Duct 10 15 15 9 5 2 4 3 5 6 15 15 9 4 4 6 4 7 14 14 14 8 4 0 1 2 4 125 Duct 10 13 13 8 4 1 4 3 5 6 13 13 8 5 3 6 5 7 Measurement of air flow Data is available in a separate brochure. Δ p t Δ p t lindab | air valves SHH Ø 100 [Pa] 200 100 50 20 2 4 6 8 12 n [#] 5 6 4 l [m] 0,2 3 2 40 35 30 L [dB] WA 25 10 1 5 10 50 100 [l/s] 5 Ø 125 [Pa] 200 100 50 20 10 50 100 q [m³/h] 2 6 5 4 l [m] 0,2 3 2 4 6 8 12 n [#] 40 35 30 25 L [dB] WA 10 1 5 10 10 50 q 50 100 100 [l/s] [m³/h] We reserve the right to make changes without prior notice 11 2014-03-07
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