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Attachment 4 - Schematic View of Exhaust Duct <br /> FSi consulting engineers LEGEND <br /> June 4, 2019 EXTRA HAZARD GROUP 2 SPRINKLER EXISTING DUCT <br /> COVERAGE PROVIDED IN DUCTWORK- <br /> WET SYSTEM EXISTING DUCT <br /> - EXTRA HAZARD GROUP 2 SPRINKLER <br /> COVERAGE PROVIDED IN DUCTWORK- EXISTING DUCT <br /> EXHAUST EXHAUST DRY SYSTEM <br /> FAN#1 7FAN#2 <br /> SPRINKLER COVERAGE PROVIDED ABOVE DUCT <br /> 11111111 NEW DUCT <br /> AT ROOF LEVEL AND BELOW DUCT TO MAINTAIN <br /> ROOF LEVEL COVERAGE.NO SPRINKLERS WITHIN DUCTWORK <br /> BUILDING TOWER <br /> SECTION OF DUCT <br /> FOR SUBJECT MEMO <br /> CATWALK LEVEL <br /> FIFTH LEVEL <br /> FORTH FLOOR <br /> THIRD FLOOR <br /> SECOND FLOOR <br /> SPRAY APPLICATION ENCLOSURE <br /> (FIRE PROTECTION PROVIDED <br /> WITHIN ENCLOSURE) <br /> FILTER STAGE#1 <br /> MODEL:PUROLATOR 2"PREBOND <br /> FLOOR LEVEL -_-_-- --__-_-_-_-_-__- lam- 4q <br /> FILTER STAGE#2 <br /> MODEL:PUROLATOR ULTRACELL(NEPA) <br /> FILTER STATE#3 <br /> MODEL:PUROLATOR SUPERSORB III <br />