“Fixed” fans tend to be made of rigid or semi-rigid materials, such as palm leaves, or have what’s known as a “leaf” of fabric or paper stretched over a rigid frame.

Source: https://www.nytimes.com/2023/12/03/fashion/fan-museum-london-caroline-allington.html

Goodyear describes them as semi-rigid airships, about the length of a football field, inflated with helium.

Source: https://www.sun-sentinel.com/2023/12/28/the-best-of-ask-lois-2023-read-the-most-popular-and-intriguing-qas/