1 CONNECT EXISTING SUPPLY DUCT TO NEW DUCT AT POINT INDICATED. DUCT TO BE SEALED AND INSULATED TO MATCH EXISTING. 2 ROUTE NEW RETURN DUCT DOWN THROUGH ROOF TRUSSES AND TRANSITION AS REQUIRED TO MAINTAIN AS CLEAR AS POSSIBLE WALKING HEIGHT ON ATTIC PLATFORM. 3 ROUTE NEW SUPPLY DUCT DOWN THROUGH ROOF TRUSSES AND TRANSITION AS REQUIRED TO MAINTAIN AS CLEAR AS POSSIBLE WALKING HEIGHT ON ATTIC PLATFORM. 4 EXISTING AIR CLEANING STATION TO BE RELOCATED AS REQUIRED FOR INSTALLATION OF NEW RETURN DUCT. EXTEND POWER WIRING AS REQUIRED. 5 CONNECT EXISTING RETURN DUCT TO NEW DUCT AT POINT INDICATED. DUCT TO BE SEALED AND INSULATED TO MATCH EXISTING. 6 PROVIDE NEW ROOF WALKING PLATFORMS, KEE SAFETY SYSTEMS 3M OR EQUIVALENT ATTACHED TO ROOF WITH "L" HOOKS AND FLASHING DESIGNED FOR SHINGLED ROOFS. 7 ROOF CURBS TO BE ALIGNED OVER TRUSSES SO THAT NO TRUSS REQUIRES CUTTING TO ROUTE DUCT FROM ATTIC TO DUCT CONNECTIONS AT ROOFTOP UNIT. 8 PROVIDE 24x36 FIRE RATED ACCESS DOOR IN HARD CEILING TO ALLOW ACCESS TO AIR CLEANING STATION. LOCATE AIR CLEANING STATION AND ACCESS DOOR OVER MAIN WALKING CORRIDOR TO ALLOW SERVICE ACCESS TO STATIONS WITHOUT HAVING TO ENTER CAGES. 9 PROVIDE NEW ROOF WALKING PLATFORMS, KEE SAFETY SYSTEMS 3M TRAVERSE OR EQUIVALENT ATTACHED TO ROOF WITH "L" HOOKS AND FLASHING DESIGNED FOR SHINGLED ROOFS. TRAVERSE PLATFORM TO ALLOW LEVEL WALKING AREA BEHIND CUPOLA FOR ACCESS TO FLAT ROOF AREAS. 10 PROVIDE GAS SHUTFOF VALVE AND REGULATOR AT EACH APPLIANCE AS REQUIRED. PROVIDE DRIP LEG PRIOR TO ENTRANCE OF EACH UNIT.
