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You should use an infrared thermometer like this to see how hot you are running. The fans you replaced were rated at 23 CFM and you have replaced them with 6 CFM fans. That's 1/4 of the air flow, not cool... (no pun intended :) ) General Tools Mini Infrared Thermometer-IRT3 - The Home Depot

Added the 120mm fan in front of the power supplies. Although its not visible in this picture, the supply on the right is the one plugged in and it's top cover is off and its two fans have been removed. That eliminated the need to put a cardboard air chute. Plenty of air blows through the...

Next I'm going to place a 120 MM fan in front of the power supplies and have a cardboard guide directing airflow right into their ends so those fans can be replaced with whisper quiet low CFM fans.

NOT! ;) The standard fans are rated at 24 CFM at full speed. This switch was designed so that one fan could fail and it would still operate within acceptable thermal criteria. I did extensive searches on DigiKey for 40MM 12V fans that were quiet and none of them had a high enough CFM rating...