Acoustic ceiling panels are required. These must have a fire performance up to CE classification A2-s1, d0. The material must have a ligth reflectance of 90%, a noise reduction coefficient not less than 0.65 and a room to room sound attenuation of not less than 30db, white, with a weight not exceeding 6kg/m2 and relative resitance to humidity of 99% at a temperature range of 12 to 35 degrees celsius.
