Manufacturer

raumAKUSTIKS

raumAKUSTIKS (owner: Helge Herrmann) manufactures custom sound absorbers in Berlin for room acoustics in offices, industrial, retail, hospitality and residential settings. Every AluWall absorber is made to measure: an aluminium frame with a highly absorbent polyester core (ISO-BOND®, thermal conductivity class WLG 040, fire class B1 per DIN 4102), or a glass-wool core for the A2 variant. The visible face is a seamlessly tensioned, flame-retardant fabric in any colour, optionally printed with high-resolution digital artwork (seamless up to 300 cm). Beyond the AluWall system, the range includes acoustic louvres, transparent honeycomb sound shields, microperforated acrylic glass and acoustic curtains. Installation and planning are available throughout Germany as well as in Austria, Switzerland and the Benelux countries.

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raumAKUSTIKS Ceiling Raft

Name: raumAKUSTIKS Ceiling Raft
Brand: raumAKUSTIKS

Acoustic Ceiling Raft (AluWall)

CeilingFree-hanging

Description

Acoustic ceiling raft freely suspended under the ceiling in the AluWall system: circumferential aluminum frame (50 mm), highly absorbent polyester core (ISO-BOND® WLG 040), and seamlessly stretched, not easily flammable fabric covering. The air gap between the raft and the raw ceiling enhances low-frequency absorption. Reverberation chamber measurement by Peutz / Fraunhofer Institute: αw ≈ 0.90, Class A (highly absorbent), suspension height 300 mm. The same component can optionally be mounted directly on a wall, ceiling, or diagonally on roof rafters. Custom dimensions, seamless up to 300 × 300 cm, unlimited in length. Suspension via steel cables with fine adjustment.

Technical data

Material: Aluminum frame (natural anodized, black or white), polyester core 2 in

Up to fire class: B1 (core material and fabric covering according to DIN 4102-1, B2 possible). A2 with glass wool core on request

Application: Suspended ceiling raft with back air gap to the raw ceiling

Certifications: OEKO-TEX Standard 100 test no. 94.0.0541 (core material), building material approval no. Z-23.1.3-278, WLG 0.035 according to DIN 52612, sound-insulating properties > 5 kNs/m⁴ according to DIN 52213, externally monitored by FIW Munich

Colours: Over 45 standard fabric colors (Kvadrat and others), additional collections on request (Gabriel, Camira). Fabric covering interchangeable and washable at 40 °C. Digital print with 150 dpi, seamless up to 118 in.

Measurement data

Sound absorption

Reverberation chamber (ASTM C423 / ISO 354)

NRC

0.85

derived from ISO 354 lab data

Frequency values

α_p nach ISO 11654

f (Hz)	125	250	500	1k	2k	4k
α_p	0.20	0.55	0.85	0.90	0.95	1.00

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Method (354): Measured

NRC: 0.85 (derived from ISO 354 lab data)

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Measured values as a table (1 measurement)

raumAKUSTIKS Ceiling Raft: sound absorption coefficient αs per ISO 354 by frequency and test build-up
Build-up	NRC	100 Hz	125 Hz	160 Hz	200 Hz	250 Hz	315 Hz	400 Hz	500 Hz	630 Hz	800 Hz	1000 Hz	1250 Hz	1600 Hz	2000 Hz	2500 Hz	3150 Hz	4000 Hz	5000 Hz
50 mm · free-hanging ceiling raft, suspension height 300 mm	0.85	0.16	0.17	0.30	0.37	0.55	0.67	0.82	0.92	0.85	0.88	0.89	0.94	0.95	0.96	0.97	1.00	0.98	0.99

Measured values as a table (1 measurement)

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Last updated: 09/04/2026