3 minutes, 30 seconds to 4 minutes
Flames poor through the doorway into the neighboring living room, setting the carpet and upholstered furniture on fire. Synthetics like polyurethane and polyester foam in sofas, pillows and carpets release tremendous amounts of heat. The temperature above the sofa quickly rises to 500 degrees F. Back in the kitchen, the blaze has penetrated the wall and ceiling and flames travel quickly through unseen structural vertical shafts in interior walls and horizontal shafts between floors. Fire spreads to the second floor.