We had ours on retail wire shelving, there was plenty of room and airflow. We used the PM2's as reverse consoles after we went digital too. Thank god we rarely

We had ours on retail wire shelving, there was plenty of room and airflow. We used the PM2's as reverse consoles after we went digital too. Thank god we rarely had to use them. But they sure were reliable. I had many PM2's with 1000+ day uptimes.