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Your local sheetmetal shop can make aluminum sheet to size to be a reflector behind the radiator.
They can make a 1/4-inch lip at the top and sides to hang the sheet from wall nails or a strip of metal bent slightly to permit the sheet lip to slide over and hang on the metal strip. This way the reflector can be removed for cleaning.
http://chi.hearth.com/data/33790.html
