Abstract: An electronics assembly for example a computer, comprises a chassis (1) having a recess therein for housing a plurality of cooling fans (30) that are arranged in series and can be removed from the recess by sliding out of the recess in a direction across the direction of intended airflow. The assembly is such that any of the fans (30) can be removed and replaced without interrupting operation of the or any other fan, and the recess and/or the fans have a seal (40, 54) to prevent or reduce bypass leakage of air around the fans.