All of my AV gear is in a cabinet with a drop down door. The cabinet is solid wood all round save for a few holes at the back for passing cables throug. Obviously it gets hot enough to grill Bacon when all the gear is on and working so I am looking for a solution to provide some cooling (other than leaving the door open) and thought of screwing a fan to the back over the vent holes to suck the hot air out. Any views and suggestions on fans to get and where from ?. Must be quiet but size isn't a major issue.