The ornamental design for a foldablefan, as shown and described.
1. Foldable fan
1.1 : Front
1.2 : Back
1.3 : Left
1.4 : Right
1.5 : Top
1.6 : Bottom
1.7 : Perspective
1.8 : Exploded bottom view
1.9 : Front view in assembled state
1.10 : Back view in assembled state
1.11 : Left view in assembled state
1.12 : Right view in assembled state
1.13 : Top view in assembled state
1.14 : Bottom view in assembled state
1.15 : Perspective view in assembled state
This design product is a foldable fan shown in reproductions 1.1 to 1.15; reproductions 1.1 to 1.7 show the fan in a folded state, while reproductions 1.9 to 1.15 show the fan in a completely assembled state; moreover, reproduction 1.8 is an exploded bottom view of this design, showing where the fan rack is stored.