In certain cases a special size format was agreed upon between publisher and agency.
In order to select a special size within DUON portal you need to create a new job and then select „Free ad Format“ under the header size.
After you have done this you have to define the size of the ad, whether this is a bleed or an ad across the gutter and finally chose the placement. Now you can check the box which says that this has been agreed upon with the publisher and then push the „apply“ button.
Please note: Don´t forget to define some bleed in your ad if regarded.