lindab | we simplify construction Perforated diffuser - semicircular CHA Technical data Nearzone ∆ p t [Pa] CHA 150 100 70 50 1207 1607 30 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 45 2010 2510 3115 4020 5020 6320 60 55 50 45 40 35 30 25 20 L WA dB(A) 500 700 1000 q V [l/ s ] 2000 3000 2000 3000 5000 q V [m 3 /h] 10000 a 0.2 [m] 2 3 45 7 10 b 0.2 [m] 15 20 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 Size 1207 1607 2010 2510 3115 4020 5020 6320 Centre frequency Hz h 63 125 250 500 1K 2K 4K 8K 11 -4 2 1 -9 -16 -28 -34 9 -2 3 0 -8 -16 -28 -34 v 10 -2 4 0 -7 -16 -28 -39 1113 01 32 --21 --77 --1157 --2279 v max --3472 7 3 2 -1 -5 -14 -19 -14 7 3 2 0 -6 -16 -19 -17 7 3 2 0 -6 -16 -29 -17 Sound attenuation Sound attenuation Δ L [dB] including end reflection. Size Centre frequency Hz 63 125 250 500 1K 2K 4K 8K 1207 19 14 5 3 2 1 2 1 1607 16 12 4 1 2 1 2 2 2010 12 8 4 2 3 2 2 2 2510 12 8 5 2 1 1 1 1 3115 11 8 3 2 1 1 2 2 4020 9 6 1 1 1 1 1 1 5020 7 5 0 1 1 1 1 2 6320 5 3 1 1 0 0 0 1 b 0,2 2 × a 0,2 a 0,2 2 × a 0,2 Table 1 Correction of the near zone (a 0.2 , b 0.2 ) U U n n d d e e r r - - t t e e m m p p e e r r a a t t u u r r e e T T i i - - T T r r - - K K 3 3 - - 6 6 K K M M a a x x i i m m u u m m v v e e l l o o c c i i t t y y m m / / s s 0 0 , . 2 2 0 0 0 0 , . 2 2 5 5 0 0 , . 3 3 0 0 0 0 , . 3 3 5 5 0 0 , . 4 4 0 0 0 0 , . 2 2 0 0 0 0 , . 2 2 5 5 0 0 , . 3 3 0 0 0 0 , . 3 3 5 5 0 0 , . 4 4 0 0 M M e e a a n n v v e e l l o o c c i i t t y y m m / / s s 0 0 , . 1 1 0 0 0 0 , . 1 1 2 2 0 0 , . 1 1 5 5 0 0 , . 1 1 7 7 0 0 , . 2 2 0 0 0 0 , . 1 1 0 0 0 0 , . 1 1 2 2 0 0 , . 1 1 5 5 0 0 , . 1 1 7 7 0 0 , . 2 2 0 0 C C o o r r r r e e c c t t i i o o n n f f a a c c t t o o r r 1 1 , . 0 0 0 0 0 0 , . 8 8 0 0 0 0 , . 7 7 0 0 0 0 , . 6 6 0 0 0 0 , . 5 5 0 0 1 1 , . 2 2 0 0 1 1 , . 0 0 0 0 0 0 , . 8 8 0 0 0 0 , . 7 7 0 0 0 0 , . 6 6 0 0 2 Lindab reserves the right to make changes without prior notice 2022-08-17
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