American Duct SealLogo Design Contest Logo Design Contest Contests / American Duct Seal American Duct Seal has selected their winning logo design. For $575 they received 100 designs from 19 different designers from around the world. Find out how LogoTournament works How LogoTournament works Contest Entries by Nafaz Return to Contest Return to Contest Withdrawn New #21 Withdrawn New #10 Discussion No comments yet.