Rectangular or round riser ducts pass through a two-hour fire-rated shaft wall with sub-ducts installed as required. The connection maintains a minimum twenty-two-inch vertical clearance above the ceiling level. A plan view presents the rectangular sub-duct layout with a round duct connection.
SUB-DUCTS AS REQUIRED DECK 2 HOUR FIRE RATED SHAFT BY GEN. CONT'R. CEILING CEILING DECK RECTANGULAR SUBDUCT ROUND CONNECTION 22" MIN. ABOVE CEILING BELOW CEILING RECTANGULAR OR ROUND RISER DUCT ELEVATION VIEW PLAN VIEW
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