ate (emphasis added), having a thickness of about 0.1 to 5 mm and an efficiency of about 5% to 80%, often 20% to 80%, made from a natural or synthetic fiber such as cellulose, polyester, ??, etc.,the board holds the combination of features as hereinafter defined in bold character as directly and unambiguously disclosed in the application as filed (for ease of understanding, the non-bolded feature