lindab | we simplify construction Fresh air valve Technical data Capacity Underpressure (Pa) 50 40 30 1 2 3 4 20 15 10 7 5 3 10 4 5 7 10 15 20 15 20 30 40 50 70 l/ s m 3 /h 100 ULA Curve 1 2 2 3 4 Filter EU-3 EU-3 - - - Sound- Insulation [mm] Ø140 / Ø50 Ø140 / Ø80 Ø140 / Ø50 Ø140 / Ø80 - free opening cm 2 20 50 20 50 50 Equivalent area cm 2 21 26 26 38 39 Dn,e (dB) Sound reduction 80 70 60 50 40 30 63 125 250 500 1000 2000 4000 Frequency ULA with sound insulation Ø140/Ø50 wall thickness: 300 mm Weighted element-normalised level difference Dn,e,w = 49 dB, Δ max = 8.3 dB Dn,e (dB) Sound reduction 70 60 50 40 30 20 63 125 250 500 1000 2000 4000 Frequency ULA with sound insulation Ø140/Ø80 wall thickness: 300 mm Weighted element-normalised level difference Dn,e,w = 46 dB, Δ max = 7.6 dB Dn,e (dB) Sound reduction 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 Frequency ULA without sound insulation wall thickness: 300 mm Weighted element-normalised level difference Dn,e,w = 38 dB, Δ max = 10.2 dB 2 Lindab reserves the right to make changes without prior notice 2020-10-21
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