Physikalisch-Technische Bundesanstalt
Source: Odeon (Index 804)
Original description
4 mm asbestos or plywood boards fastened at random intervals (at least 0.4 * 0.6 m), over 75 mm cavity with 25 mm mineral wool
ISO 354 – reverberation chamber
αp nach ISO 11654
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Method (354): Measured
