Abstract: A fan tray assembly is adapted to be attached to an electronics enclosure. It draws in air from below and pushes the air upward toward the enclosure. The fan tray cools electronics in a card cage portion of the electronics enclosure that includes a backplane, the card cage, a plenum beneath the card cage and a card cage door. The fan tray has two sides, a front and a back, and a rectangular shape. The fan tray mounts under the plenum of the electronics enclosure by sliding into place. The fan tray bottom has apertures to allow entry of air and a plurality of fans disposed in an array, each fan positioned over an aperture. A filter is disposed beneath the tray and sized to filter air into all apertures. Power connector and signal connectors connect to cables transporting signals between the back plane and the fan tray and bring power to the fans. The fan tray cannot be slid from a home position when the power connector is engaged with a power connection. The front panel of the fan tray closes with slam locks.