JHNY, Inc. (JHNY) appeals a Default Order issued by Administrative Law Judge (ALJ) William B. Moran assessing a $51,700 penalty against JHNY for Clean Air Act (CAA) violations as well as the ALJ's denial of JHNY's motion to set aside the Default Order. The ALJ's entry of default was based on JHNY's failure to timely comply with the ALJ's Prehearing Order directing the parties to exchange prehearing information.