Under what circumstances must public service advertisements be hung on construction site fences in Foshan, Guangdong?

The construction site is fenced. According to the query on the National Party Media Information Disclosure Platform. According to the "National Standards for Field Inspection Sites for the Creation of Civilized Cities", all building enclosures (including newly started construction sites) must carry public service advertisements, and the publicity display area shall not be less than 30% of the area of ??the enclosure wall (the blank space for text-based public service advertisements shall be included) public service advertisement display area), or there should be at least one public service advertisement in every three advertisements. Therefore, if the construction site is fenced, public service announcements must be hung.