lindab | we simplify construction Supply air nozzle GD 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 Size GD Centre frequency Hz 63 125 250 500 1K 2K 4K 8K 9 -2 0 1 -6 -14 -21 -25 Supply air L ;M= '$ '$ L ;M= Q 6 ;LS= Q 6 ;M H= ǻ p t [Pa] GD 500 400 300 200 150 100 70 50 30 20 15 10 10 40 50 45 40 35 30 25 20 15 20 50 60 70 80 30 100 40 150 L WA dB(A) 50 60 200 q V [l/s] 70 80 q V [m 3 /h] 2 Lindab reserves the right to make changes without prior notice 2020-12-18
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