A fan assembly includes a chassis and a fan bracket secured in the chassis. The chassis has a bottom wall. The fan bracket includes a first sidewall and a second sidewall perpendicular to the bottom wall, and it is configured for securing the fans. A securing flange extends from an edge of the first sidewall, and is secured to the bottom wall of the chassis. A plurality of securing slots is defined in the securing flange. A plurality of first members engages in the securing slots and isolates the bottom wall of the chassis from the securing flange.