The floor of the fire room. Note the deep alligatoring of the wood. 
The outside of the closet door burned to the floor level. 
The closet door, now open, charred to around mid-wall. 
The top line points to where the cup lid was hung. It melted off the hook. Below the bottom line the wall was cool enough to touch with bare skin. 
The cup lid at 2 feet was undamaged. The other side of the wall is the fire room. The open space on the right is the door opening.
The following are taken from one of our training burns. The fire room had a small, 2′ by 4′ closet in it. A coffee cup lid was hung on a hook 5′ off the ground. Another coffee cup with a lid was placed at around the 2′ mark.
The fire, from ignition to extinguishment was around 9 minutes.
Temperatures on the floor of the closet were survivable throughout the fire the early threat to a child in the closet would be from smoke or lack of oxygen. A victim trapped in the closet needs to be removed from the threat. From the exterior, it would be impossible to know if there was survivable space in the room. Only by making entry and putting out the fire would this space get searched.
