Series fan assembling structure

A series fan assembling structure comprising:

• a connection assembly having a first connection member, a second connection member and a third connection member, the first connection member having a first end face and a second end face opposite to the first end face, the second connection member being disposed at an upper end of the first connection member to outward horizontally extend from the first end face, the third connection member being disposed at a lower end of the first connection member to outward horizontally extend from the second end face, the second connection member and the third connection member horizontally extending in reverse directions, a passage being formed at centers of the first and second end faces;
• a first fan mated with the first end face of the first connection member, the first fan having a first fan frame and a first flow passage passing through the first fan frame, the first fan frame being connected with the second connection member in a horizontal position, the first flow passage communicating with the passage;
• and
• a second fan mated with the second end face of the first connection member, the second fan having a second fan frame and a second flow passage passing through the second fan frame, the second fan frame being connected with the third connection member in a horizontal position, the second flow passage communicating with the passage.