Classification of a sound absorber is important for a number of reasons. The most important being that you as a customer shall be sure of what you are buying – and that you get the most efficiency out of your purchase. In order to classify a product an independent testing facility measures it in order to find out how good the product actually is. This measurement is compared to the demands of the adequate ISO- certification. A product that receives the Sound absorption Class A upholds the highest demands and it means that you as a cusomer can feel safe in your choice. Below illustrations shows how you can compare the different levels. Class A is the reference to the left.