Acoustic IndexAcoustic Index

Fural L-Absorber

L-Absorber

NRC 0.65–0.70

EPD availableWall
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Manufacturer

Fural Systeme in Metall GmbH

Fural manufactures modular metal ceiling systems with outstanding acoustic performance. Every metal ceiling is an acoustic ceiling with additional functions such as fire protection, cooling, heating, hygiene or impact resistance. Certified to TAIM, with EPDs available for steel and aluminium systems.

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Description

L-shaped wall absorber element for mounting on a substructure. The perforated metal surface is combined with a mineral wool or sheep's wool layer. Targeted retrofit room-acoustics optimization, also for refurbishment of existing buildings. 12 tested configurations.

Technical data

Material: galvanized steel
Surface: RAL 9010, powder coating 60–70 μm
Fire class (EN 13501-1): A1 (DIN EN 13501-1)
Application: L-Absorber

Measurement data

Sound absorption

Reverberation chamber (ASTM C423 / ISO 354)· 12 variants

Size

NRC
0.70

Frequency values

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ComparePerforationSizeTest setupValue
Rg 0.7-4%3.9 in build-up2.4 in sheep wool 1.2 lb/ft³; 39 in floor legNRC0.70
Rg 2.5-16%3.9 in build-up2.4 in sheep wool 1.2 lb/ft³; 53 in floor legNRC0.70
Rg 2.5-16%5.9 in build-up2.4 in sheep wool 1.2 lb/ft³; 53 in floor legNRC0.70
Rg 2.5-16%7.9 in build-up2.4 in sheep wool 1.2 lb/ft³; 53 in floor legNRC0.70
Rg 0.7-4%3.9 in build-up2.4 in sheep wool 1.2 lb/ft³; 53 in floor legNRC0.70
Rg 0.7-4%5.9 in build-up2.4 in sheep wool 1.2 lb/ft³; 53 in floor legNRC0.70
Rg 2.5-16%3.9 in build-up2.4 in sheep wool 1.2 lb/ft³; 39 in floor legNRC0.70
Rg 2.5-16%5.9 in build-up2.4 in sheep wool 1.2 lb/ft³; 39 in floor legNRC0.70
Rg 2.5-16%7.9 in build-up2.4 in sheep wool 1.2 lb/ft³; 39 in floor legNRC0.70
Rg 0.7-4%5.9 in build-up2.4 in sheep wool 1.2 lb/ft³; 39 in floor legNRC0.65
Rg 0.7-4%7.9 in build-up2.4 in sheep wool 1.2 lb/ft³; 39 in floor legNRC0.65
Rg 0.7-4%7.9 in build-up2.4 in sheep wool 1.2 lb/ft³; 53 in floor legNRC0.65

Test report: M 105629/32 (Aufbau 1)

NRC: 0.70 (derived from ISO 354 lab data)

Institute: Müller-BBM

Dimensions: 3.9 in total height

Test setup: 2.4 in sheep wool 1.2 lb/ft³; 39 in floor leg

Terms of use
Measured values as a table (12 measurements)
Fural L-Absorber: sound absorption coefficient αs per ISO 354 by frequency and test build-up
Build-upNRC100 Hz125 Hz160 Hz200 Hz250 Hz315 Hz400 Hz500 Hz630 Hz800 Hz1000 Hz1250 Hz1600 Hz2000 Hz2500 Hz3150 Hz4000 Hz5000 Hz
Rg 0.7-4% · 3.9 in build-up · 2.4 in sheep wool 1.2 lb/ft³; 39 in floor leg · fleece0.700.320.400.520.560.670.700.740.760.730.720.690.620.590.630.620.570.540.51
Rg 2.5-16% · 3.9 in build-up · 2.4 in sheep wool 1.2 lb/ft³; 53 in floor leg · fleece0.700.390.480.560.650.710.730.750.760.750.760.740.700.640.640.670.650.630.62
Rg 2.5-16% · 5.9 in build-up · 2.4 in sheep wool 1.2 lb/ft³; 53 in floor leg · fleece0.700.390.470.570.670.710.730.750.770.750.750.710.680.660.650.670.660.640.62
Rg 2.5-16% · 7.9 in build-up · 2.4 in sheep wool 1.2 lb/ft³; 53 in floor leg · fleece0.700.390.500.580.690.710.720.750.760.740.730.690.710.650.650.680.660.640.63
Rg 0.7-4% · 5.9 in build-up · 2.4 in sheep wool 1.2 lb/ft³; 39 in floor leg · fleece0.650.330.400.520.560.670.710.730.740.730.690.640.620.610.620.630.570.550.52
Rg 0.7-4% · 7.9 in build-up · 2.4 in sheep wool 1.2 lb/ft³; 39 in floor leg · fleece0.650.320.390.520.590.670.690.710.710.700.660.640.620.600.630.620.580.540.51
Rg 0.7-4% · 3.9 in build-up · 2.4 in sheep wool 1.2 lb/ft³; 53 in floor leg · fleece0.700.320.360.490.570.650.680.730.750.740.740.710.640.600.630.630.570.550.50
Rg 0.7-4% · 5.9 in build-up · 2.4 in sheep wool 1.2 lb/ft³; 53 in floor leg · fleece0.700.290.360.490.580.650.670.730.750.740.710.670.640.610.630.630.580.560.52
Rg 0.7-4% · 7.9 in build-up · 2.4 in sheep wool 1.2 lb/ft³; 53 in floor leg · fleece0.650.320.390.500.600.650.670.720.740.720.690.670.650.600.630.630.580.560.52
Rg 2.5-16% · 3.9 in build-up · 2.4 in sheep wool 1.2 lb/ft³; 39 in floor leg · fleece0.700.390.430.580.650.750.740.770.750.740.730.710.680.630.620.660.640.630.62
Rg 2.5-16% · 5.9 in build-up · 2.4 in sheep wool 1.2 lb/ft³; 39 in floor leg · fleece0.700.390.470.590.670.750.750.770.740.730.710.680.660.650.630.660.640.630.62
Rg 2.5-16% · 7.9 in build-up · 2.4 in sheep wool 1.2 lb/ft³; 39 in floor leg · fleece0.700.400.530.610.690.750.740.750.730.710.670.660.670.630.640.670.650.620.60
Measured values as a table (12 measurements)

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