Blew a breaker on the circuit that runs the exhaust fan in my rodent room. The temperatures quickly soared to over a hundred degees and the air quality was so bad I almost passed out walking into the room. More then half of my adult breeder rats were dead and the bodies had quickly putrified in the heat. The rodent urine from the tubs was evaporating into the air increasing the humidity in the room to about 100% there was so much moisture in the air that the walls were running with condensation that was mixing with rodent dust causing brown streaks running down my walls and brown puddles pooling on the floor. I had to wear multiple masks and I was still dry heaving every time I walked into the room to grab another tub to clean.