EE WENT TO HIS WORK AREA AT THE START OF SHIFT AND NOTICED VENT-BAG WAS KNOCKED DOWN AFTER P.M.SHIFT BLAST AT THE END OF SHIFT. EE RETREATED BACK TO BETTER AIR AFTER HANGING BAG ON RIB. EE RETREIVED A FAN THAT WASN'T BEING USED FROM THE CENTRAL LOCATION RAMP AND ADDED FAN FOR BETTER VENTILATION, EE ADDED VENT BAG AND BECAME DIZZY & WEAK.