Turned on the fan and felt air coming from under the butler cabinet, that's what I call it , so I pulled out the drawers and found a HUGE opening to the area where all the plumbing and duct work is located which would defeat the purpose of running the fan to remove heat build up as it would allow it to draw air from outside the boundaries of the living space. Here a couple pics of before and after. I just used cardboard to block off the opening which is about 95% effective.Click image for larger version. 

Name:	butler pantry storage cabinet.jpg 
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ID:	781Click image for larger version. 

Name:	butler pantry storage cabinet 2.jpg 
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ID:	782