I have an entertainment center that houses my HT equipment in enclosures with doors. So far I have had no heat issues, but I want to add a Comcast DVR which apparently generates quite a bit of heat.
I would like to install a small quiet fan in the enclosure that will house the DVR and any recommendations on a small fan (120V) would be appreciated.
Check out industrial or electrical supply houses. Depending on what companies are around your area, any decently sized shop should have a selection. You can start with Graingers, a large chain throughout most of the middle of the US. Pick the size and velocity you require and install the fan at the top of the cabinet where heat rises and you are drawing cooler air across the equipment.