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` ROOF & AT11C VENTILATION Z$S � <br /> ALL VENTS TO BE SCREENED W/1/4" CORROSION _-- - __ ��� <br /> G��'"�� RESISTANT METAL MESH. (3) 2" 0 HOLES PER VENT BLOCK = _ � -__ _ - __ z�� �� <br /> 7.0 SQ. IN. NET AREA(74%). LOCATE VENT BLOCKS AT - - <br />