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r 8" X 8" WOOD TIMBERS <br /> ANCHORED INTO THE ROCK <br /> FAN <br /> DOORS FOR VENTILATION <br /> AND LIGHT. <br /> 1 1 /2" X 10" LUMBER <br /> 3/4" PLY BACKING <br /> HORIZONTAL TMBERS <br /> ANCHORED INTO THE ROCK <br /> ELEVAT ON <br /> FROM NTERIOR <br />