lindab | we simplify construction Perforated diffuser - semicircular CBA Technical data ∆ p t [Pa] CBA 150 100 70 50 1207 1607 3 0 20 15 10 7 5 3 2 30 40 50 70 100 150 200 300 150 200 300 500 700 1000 0.5 1 2 3 4 5 2010 2510 3115 4020 5020 60 55 50 45 40 35 30 25 20 L WA dB(A) 500 700 1000 2000 3000 2 3 7 10 q V [l/s] 2000 q V [m 3 /h] 5000 7000 a 0.2 [m] 4 b 0.2 [m] 15 Recommended maximum volume flow. The near zone is given at an under-temperature of -3 K to a maximum terminal velocity of 0.20 m/s. Conversion to other terminal velocities - see table 1, correc- tion of the near zone for -3 K and -6 K respectively. Nearzone Large diffusion (factory setting) h v v max Small diffusion b 0,2 2 × a 0,2 Sound effect level h Sound effect level L W [dB] = L WA + K ok Size 1207 1607 2010 2510 3115 4020 5020 Centre frequency Hz 63 125 250 500 1K 2K 8 -3 0 1 -8 -15 10 -3 3 0 -8 -18 15 -2 3 0 -9 -16 10 -1 4 -1 -9 -16 11 1 4 -1 -8 -17 13 3 4 -1 -9 -17 7 2 2 0 -6 -16 v v max 4K 8K -27 -38 -30 -33 -30 -37 -29 -41 -30 -42 -30 -43 -19 -17 Sound attenuation Sound attenuation Δ L [dB] including end reflection. Size 1207 1607 2010 2510 3115 4020 5020 Centre frequency Hz 63 125 250 500 1K 2K 4K 8K 19 14 5 3 2 1 2 1 16 12 4 1 2 1 2 2 12 8 4 2 3 2 2 2 12 8 5 2 1 1 1 1 11 8 3 2 1 1 2 2 9 6 1 1 1 1 1 1 7 5 0 1 1 1 1 2 a 0,2 2 × a 0,2 Table 1 Correction of the near zone (a 0.2 , b 0.2 ) Under- temperature T i -T r -3K -6K Maximum velocity m/s 0.20 0.25 0.30 0.35 0.40 0.20 0.25 0.30 0.35 0.40 Mean velocity m/s 0.10 0.12 0.15 0.17 0.20 0.10 0.12 0.15 0.17 0.20 Correction factor 1.00 0.80 0.70 0.60 0.50 1.20 1.00 0.80 0.70 0.60 2 Lindab reserves the right to make changes without prior notice 2020-10-06
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