lindab | we simplify construction Perforated diffuser - rectangular CRA Technical data ∆ p t [Pa] CRA 70 50 3010 30 20 15 10 7 5 4 50 70 100 150 200 200 300 400 500 700 1 3 4 5 5010 8010 8020 50 45 40 35 30 25 20 L WA dB(A) 300 400 1000 2 7 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. 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 Sound effect level L W [dB] = L WA + K ok h Size Centre frequency Hz 63 125 250 500 1K 2K 4K 8K 3010 9 -1 5 -1 -11 -17 -30 -41 5010 7 1 4 0 -11 -19 -32 -42 v 8010 15 0 4 0 -12 -20 -31 v max -43 a 0,2 8020 10 4 6 -2 -11 -21 -33 -39 2 × a 0,2 Sound attenuation Sound attenuation Δ L [dB] including end reflection. Size Centre frequency Hz 63 125 250 500 1K 2K 4K 8K 3010 11 7 6 4 2 2 1 2 5010 10 6 6 4 2 2 1 2 8010 10 6 4 3 2 1 1 1 8020 7 4 3 2 1 1 1 1 Table 1 Correction of the near zone (a 0.2 , b 0.2 ) Under- temperature T i - T r -K3 -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 2020-10-08
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