lindab | we simplify construction Multi-cone diffuser Technical data Following FKD+plenum box data are valid for MBB-S. For MBC data, go to www.lindQST.com. Capacity Volume flow q v [l/s] and [m 3 /h], total pressure Δ p t [Pa], throw l 0.2 [m] and sound power level L WA [dB(A)] can be seen in the diagrams. Throw l 0.2 Throw l 0.2 [m] can be seen in the diagram for isothermal air at a speed of 0.2 m/s. Frequency-related sound effect level The sound power level in the frequency band is defined as L wok = L WA + K ok . K ok values are specified in charts beneath the diagrams on the following pages. K ok values for FKD without a box can be found in a separate supplement. Sound attenuation Sound attenuation of the diffusers Δ L from duct to room, including end reflection, see table below. FKD + MBB-S duct FKD Ød 1 100 Ød 2 160 125 160 125 200 160 160 160 200 160 250 200 200 200 250 200 315 250 250 250 315 250 400 315 315 315 400 Centre frequency Hz 63 125 250 500 1K 2K 4K 8K 20 16 5 15 17 17 16 19 13 13 8 19 13 16 16 19 15 11 6 15 12 14 16 17 16 17 10 18 17 18 20 21 15 14 7 19 15 16 18 19 17 16 4 16 15 16 16 18 13 10 6 15 18 15 19 17 13 9 4 12 17 13 17 16 13 8 3 8 16 14 16 15 14 8 8 15 17 17 17 18 13 6 5 13 15 15 16 17 12 4 3 12 13 14 14 15 7 9 8 12 17 16 17 21 7 8 7 11 16 14 16 19 Balancing Balancing data is contained in a separate brochure. FKD Horizontal l 0.2 [m] 20 FKD 15 355 450 160 200 250 315 400 500 630 10 8 7 6 5 4 3 2 40 50 60 70 80 100 150 200 300 150 200 300 500 700 900 l 0.2 [m] 400 500 1500 2000 700 1000 3000 q V [l/s] q V [m 3 /h] ǻ p t [Pa] FKD 100 160 200 250 315 355 400 450 500 70 630 50 50 45 30 40 20 35 15 30 10 25 7 20 L WA dB(A) 5 q V [l/s] 50 60 70 100 150 200 300 400 500 700 1000 1500 2500 200 300 400 500 700 1000 1500 2000 3000 5000 7000 q V [m 3 /h] Lindab reserves the right to make changes without prior notice 3 2021-10-13
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