510 ILCS 72/120
In a case involving the refusal to issue or renew a certificate or the discipline of a certified agency or technician, a copy of the hearing officer's report shall be served upon the respondent by the Department, either personally or as provided in this Act for the service of the notice of hearing. Within 20 days after such service, the respondent may present to the Department a motion in writing for a rehearing, which shall specify the particular grounds for rehearing. If no motion for rehearing is filed, then upon the expiration of the time specified for filing the motion, or if a motion for rehearing is denied, then upon such denial the Director may enter an order in accordance with recommendations of the hearing officer except as provided in Section 125 of this Act. If the respondent shall order from the reporting service and pay for a transcript of the record with the time for filing a motion for rehearing, the 20 day period within which such a motion may be filed shall commence upon the delivery of the transcript to the respondent.
510 ILCS 72/120