Valve lindab | air valves KDPF Technical data Air flow, q [l/s] and [m 3 /h], total pressure drop, Δ p t [Pa], and A-weighted sound power level, L WA [dB], for different settings, n [number of open holes], are shown in the graphs. Measurement of air flow Data is available in a separate brochure. 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 – -5 -4 -3 -3 -8 -13 -16 Sound attenuation, Δ L, [dB] Ød Valve Number Centre frequency nom mounted of open [Hz] in holes 63 125 250 500 1K 2K 4K 8K 2 – 23 22 24 18 16 15 10 100 Duct 6 – 19 16 15 12 8 10 7 12 – 19 15 12 9 5 5 3 Δ p t [Pa] Ø 100 2 200 100 50 20 10 5 20 Number of open holes 3 4 6 8 10 12 35 30 25 L WA [dB(A)] 10 20 30 40 50 [l/s] 50 100 180 [m 3 /h] q We reserve the right to make changes without prior notice 45
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