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The smoke from the fires was black indicating a low oxegen fire, the antithesis of a kiln. There are photographs (sorry Farhad I know that you have "debunked" photographs) showing a woman standing in the hole that the plane made in WTC 1. The impact on WTC 2 was at an oblique angle and the photos show a huge fireball blowing out the side, most of the fuel burned in that fireball. Firefighters who made it to the impact site described the fires as light and isolated that could be knocked out with 2 hoses.
Here is a picture of a woman waving from inside your "kiln". http://www.whatreallyhappened.com/wtc1_woman.html
And the two firemen seemed not to have been affected by the "kiln" either.
Battalion Seven Chief (Palmer): "Battalion Seven ... Ladder 15, we've got two isolated pockets of fire. We should be able to knock it down with two lines. Radio that, 78th floor numerous 10-45 Code Ones.
Ladder 15: "Chief, what stair you in?"
Battalion Seven Chief: "South stairway Adam, South Tower."
Ladder 15: "Floor 78?"
Battalion Seven Chief: "Ten-four, numerous civilians, we gonna need two engines up here."
Battalion Seven Chief: "Tower one. Battalion Seven to Ladder 15."
Battalion Seven Chief: "I'm going to need two of your firefighters Adam stairway to knock down two fires. We have a house line stretched we could use some water on it, knock it down, okay."
Ladder 15: "Alright ten-four, we're coming up the stairs. We're on 77 now in the B stair, I'll be right to you."
Battalion Seven Operations Tower One: "Battalion Seven Operations Tower One to Battalion Nine, need you on floor above 79. We have access stairs going up to 79, kay."
Battalion Nine: "Alright, I'm on my way up, Orlo."[52]
Here, Battalion Chief Palmer calls for more men and water to put out the isolated fires. His expression “10-45 Code Ones” refers to dead bodies, of which apparently there were many. The tape shows that the two firemen were not turned back by heat, smoke, or a wall of flames. They were able to function within the fire zone and were prepared to help the injured and combat the few isolated fires they found. Palmer even mentions that the stairway up to the next level, i.e., floor 79, was passable. Minutes later the building came down on their heads.
As for your theory that the planes "burning inside" somehow contributed to the collapse, well, you should know that no one, no one, says that buildings collapsed due to fire. The iron micro-spheres remain. Unexplained by the new "kiln" theory