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This kind of single light protection can be constructed either by using a minimum 3 inches thick incombustible cement plate reinforced with fiber, or by fastening an at least 20 gauge sheet metal plate densely enough to the wall. A minimum 1-1/4" space must be left between the protective plate and the wooden surface to be protedted. This can be done by using spacers as intermediate supports (Figure 2) I7ÏÏÏ1 3. The safety distance mentioned on item 1 can be further decreased to minimum 5 inche