A fan frame is provided and includes a body and a first cover plate. The body includes a main surface and a first side which is substantially perpendicular to the main surface. A first channel and a second channel, which are adjacent to each other, are formed in the body, and a first space is formed among the main surface, the first side, a sidewall of the first channel, and a sidewall of the second channel. The cover plate is disposed on the body, and covers the first space, wherein a first hole is formed in the first cover plate, and the first space communicates with the external environment via the first hole.