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UNITS, TANKS AND PIPING .......................10 VENT AND COMBUSTION AIR HOODS..................11 OPT ECONO/MOTORIZED DAMPER RAIN HOOD .........11 ENTHALPY SET POINT ADJUSTMENT........................11 PWR EXH/BARO RELIEF DMPR & RAIN HOOD OPT.......11 OPERATION ...................................19 COOLING SYSTEM ..................................19 PRELIMINARY OPERATION COOLING ..................19 COOLING SEQUENCE OF OPERATION .................19 NO OUTDOOR AIR OPTIONS ............