■ Material: Galvanized Steel Sheet ■ Feature: ? The inner of anechoic chamber is stuffed with the thickness of 50mm centrifugal glass wool, the outer is covered with glass fiber fabric and also perforated plate of Φ4mm aperture,the stud is made up of galvanized plate. ? On the situation of H<400 or W<250, there is no inlet baffles. ISO9001:2000