lindab | we simplify construction Perforated diffuser - rectangular CEA Technical data Nearzone ∆ p t [Pa] CEA 70 50 30 20 15 10 7 5 4 50 70 100 150 200 300 400 500 1 3 4 2010 200 700 5 2510 3115 4015 50 45 40 35 30 25 20 300 400 1000 2 7 L WA dB(A) q V [l/s] 500 700 1000 2000 3000 q V [m 3 /h] a 0.2 [m] 3 b 0.2 [m] 10 Recommended maximum volume flow. h v v max a 0,2 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. Large diffusion (factory setting) Small diffusion Sound effect level Sound effect level L W [dB] = L WA + K ok h b 0,2 2 × a 0,2 Size 2010 2510 3115 4015 Centre frequency Hz 63 125 250 500 1K 2K 11 4 4 -1 -8 -14 8 4 2 0 -6 -16 14 6 3 -1 -8 -17 11 3 2 1 -10 -18 4K 8K v -25 -37 v max -27 -40 -29 -25 -30 -37 Sound attenuation Sound attenuation Δ L [dB] including end reflection. Size 2010 2510 3115 4015 Centre frequency Hz 63 125 250 500 1K 2K 4K 8K 10 6 1 4 5 3 4 4 10 6 6 4 2 2 4 3 9 6 5 3 3 4 4 5 8 5 3 3 2 3 4 4 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 2020-10-07
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