Public interest exemption allows goods of a class or description to be exempted from Chapter IVA or IVB provisions by notification. The Central Government may, if satisfied that exemption is necessary in the public interest, notify an exemption for goods of any class or description from all or any provisions of Chapter IVA or Chapter IVB. The exemption may be absolute or subject to conditions specified in the notification, and it is issued by notification in the Official Gazette.