F1

The F1 paper size has dimensions of 660mm x 841mm, resulting in a total surface area of 0.5542 square meters. As part of the regional F series of transitional paper formats used in China and Southeast Asia, F1 serves as an incremental size between the very large F0 and the PA1 format. The landscape orientation and 4:3 aspect ratio of F1 differentiate it from the narrower PA sizes while aligning with traditional East Asian paper dimensions. While F1 has no distinct alternative names, its size falls between the non-standard Emperor and Antiquarian formats. Typical applications taking advantage of its considerable area include oversized artwork, multi-panel diagrams, and specialty packaging/displays. The F series dates back to bridging gaps in the limited ISO standard sizes to suit regional preferences. As such, F1 lacks its own extensive history but has shown its usefulness as a transitional jump between F0 and PA1. Catering to East Asian contexts, F1 brings the F series down to more practical dimensions from the extremely large F0 while still satisfying needs for an area greater than PA1 allows.