A party may apply for a protective order to close part of a hearing. The party making the request should state the reasons for making the application to the presiding officer. If the other party opposes the request, a written response to the request shall be made within 10 days of the request to the presiding officer. The presiding officer shall determine which, if any, parts of the proceeding shall be closed, and state the reasons therefore in writing within 20 days of receiving the request.