The air-conditioning system was heavily modified to prevent smoke from entering hotel rooms, and large exhaust fans were installed, with the capability to rid the hotel of fumes in 10 minutes. Plastic pipes and wires, which contributed to the fire, were removed. A five-minute fire safety program, hosted by Gene Kelly in both English and Spanish, was played on televisions in hotel rooms. Resort officials believed that the MGM was now the safest hotel in the world. A minor incident occurred two weeks after the reopening, and the new safety features worked as planned. Insulation material had begun to smolder because of a welder's torch, and this set off automatic alarms.