I have build-in cabinets that house all my gear. The cabinets themselves are made of wood, with wooden shelves and glass doors. The issue is that the cabinet tempterature often exceeds 100 degrees during the summer(highest I've seen is 110). I live in a really old house, therefore there is no air conditioning. I have three 2-inch ventilation holes cut in the top of the two cabinets that house the gear, but this obviously is not doing much to help. So here are the options. I have purchased two 4 inch AC power fans that can be plugged into the switched outlets on the back of my receiver. However, in testing these proved to be a little noisy. I saw another post that recommended buying an extension cord with a dimmer switch on it. This may work. If this does, one option is to simple put the fan in the cabinet to circulate air. The other would be to place it on top to pull the hot air out. One other option may be to vent it to the outside since the back of the cabinets backs to an exterior wall. Has anyone seen something that might be more like a bathroom fan that could be employed in this situation to provide good ventilation, while moving the fan out of the room? Any other suggestions?