nathan7774 nathan7774 17-01-2024 Engineering contestada Which of the following three hazard classes should NOT be placed into a temperature-controlled trailer (one with a heater or air conditioner unit)? 1) Classes 1, 4, and 5.1 2) Classes 1, 3, and 4 3) Classes 1, 2.1, and 3 4) Classes 1, 3, and 6