JOCAVI Acoustic Panels WAV/I060 ATP WAVYFUSER/Inverted Acoustic Diffuser Panel, Grey - 2 Units Average diffusion: 0.57 (&gt;100Hz; &lt;5KHz). NRC: 0.21 (&gt;100Hz; &lt;5KHz). Finished with an ecological paint. Color: GREY, RAL7015 EPS Fire Reaction: Euroclass E (NP EN 13501-1). Self-adhesive mounting strips included for easy installation.