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Well, there are 3 different ways to transfer heat; radiation, conduction and convection. Why not use all three?
1. Paint the inside of the box black to absorb the heat *radiated* from the tubes/flyback.
2. The heat would be *conducted* through the metal to the outside surface.
3. Mount cooling fins on the outside of the box so that natural or fan-induced *convection* can carry the heat away.
jr
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