How many people is a 4m banner suitable for?

1-1 people. Horizontal calligraphy and painting, slogans, pennants, etc. are hung on the crossbar, and two flag poles are sometimes installed in the frame. Banners are a specification in ancient calligraphy, and banners made in modern times are often propaganda banners, including banners on websites.

Banners are advertisements or slogans, which play a role in publicity and promotion.