lindab | we simplify construction Supply air nozzle LAD Technical data Capacity Volume flow q v [l/s] and [m 3 /h], total pressure Δ p t [Pa], throw l 0.3 [m] and sound power level L WA [dB(A)] can be seen in the diagrams. Throw l 0.3 Throw l 0.3 can be seen in the diagrams for isothermal air at a terminal velocity of 0.3 m/s. Resulting sound effect level The sound effect level from the nozzles must be added loga- rithmically to the sound effect level from the flow noise in the duct. See sample calculation, section Nozzle calculations. Frequency-related sound effect level The sound effect level in the frequency band is defined as L WA + K ok K ok values are given in charts beneath the diagrams on the following pages. Table 1 Centre frequency Hz Size 63 125 250 500 1K 2K 4K 8K 125 13 4 3 -5 -4 -18 -21 -21 160 19 6 5 -3 -10 -23 -30 -34 200 18 6 1 -1 -10 -15 -18 -26 250 19 6 3 -1 -14 -21 -24 -26 315 22 5 2 -3 -12 -14 -22 -27 400 21 3 1 -5 -7 -10 -19 -25 Supply air l 0.3 [m] 40 30 LAD 125 160 200 250 315 400 20 15 10 7 5 4 3 2 1 5 20 10 15 20 30 30 40 50 60 80 100 40 50 60 150 200 l 0.3 [m] 80 100 300 150 200 500 700 q V [l/s] 300 q V [m 3 /h] 1000 ¨S T ;0A= ,!$ , 7! D"! Q 6 ;LS= Q 6 ;M H= 2 Lindab reserves the right to make changes without prior notice 2021-11-08
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