I am trying to find out the heat dissipation of a Cisco 4507R+E switch with Dual 6000W Power Supplies.  If you look at the Catalyst 4500 E-series Specifications it says 2720 BTU/hr for a 6000W power supply.  If you go to the Cisco configurator, it won't let you put in the power supply but it gives you 6246.32 BTU/hr for a fully loaded switch with (5) 4748 cards and (2) Sup8-E.  It adds another 3345.07BTU/hr if you put in 240 PoE devices but I think most of that heat is at the desktop device.  What is the actual BTU/hr number to use? Do I need to add the BTUs for the Power supply to the BTUs for the fully loaded switch?  Thanks!