2: A somewhat similar thing would happen with the Ascend TNT Max, which had side-to-side airflow. These were dial termination boxes, and so people would install racks and racks of them. The first one would draw in cool air on the left, heat it up and ship it out the right. The next one over would draw in warm air on the left, heat it up further, and ship it out the right... Somewhere there is a fairly famous photo of a rack of TNT Maxes, with the final one literally on fire, and still passing packets.