[miniman82]

I don't think a fan would be required for the common B&W 50's sets, they actually don't put off too much heat. It's the older 50/60's color sets you have to worry about, they consume literally twice the power of a similarly sized B&W one. Like Bob G, I will be installing small muffin fans into the HV cage of all my color sets soon. It should help guard against flyback overheating, since those parts are unobtainable now.