The nice thing about radiators is that for the most part they heat the objects in a room through radiant heat and the air is heated by those objects being warm, put a box around it and it will heat that box an then heat the air and that will make the air feel warmer but not the rest of the house, adding reflective insulation behind them is most likely one of the best things you can do, even a sheet of tin foil will help a great deal.
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