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4 <br />5 A -6 <15 <br />22 <br />3 <br />A -6 <br />15 <br />CORE HOLE <br />FOR ROOF N <br />WATER PIPE <br />EXISTING 10 "x10" <br />EXH. DUCT <br />FILE ST <br />CUT OPENINGS IN <br />CONCRETE WALL <br />FOR <br />26" X 12" RETURN <br />AIR DUCTS <br />23 <br />FEC -FR <br />200 <br />23 <br />NOTE: INFILL <br />EXISTING SU <br />DUCT WALL <br />WITH 75% SC <br />IN CORRIDOF <br />713 oo <br />( <br />CUT OPENING IN CONC <br />G(JF(F(j WALL FOR 1" X 1" RETURN <br />N <br />23 201 DUCT <br />_C- <br />C <br />20 <br />CG <br />20 <br />FILE STORAGE <br />GE <br />