The hollow body of the sealing apparatus is ventilated to atmosphere or to a vacuum before the departure of the elevator car from the floor such that the hollow body retracts so as to assure the spacing which is necessary for the free travel of the elevator car in the shaft. The sealing apparatus is monitored for low and excess pressure conditions.
WTC Chief Electrical Design Engineer Calls for New 9/11 Investigation: An Exclusive Interview with Richard Humenn, P.E.E.
MB: In regards to the elevator shafts, it has been suggested that burning jet fuel travelled through them down to the lobby of the twin towers. Is this possible?
RH: That’s impossible – the volatility of airplane fuel is such that any flame would go up – there’s no way for the fuel to flow down, because it would have all burned up right where it was. When the plane penetrated the walls, there would have been an immediate updraft. Even smoke wouldn’t go down – it would go up and out where the exposed areas were – where the planes had hit.
MB: So all the damage in the lobby – evidence of bombs in the lobby and basement levels – you don’t see any way that came from the upper levels?
RH: No way – those had to be totally independent incidents.
MB: Knowing the buildings so well, do you think that a controlled demolition could have been set up without attracting the attention of building occupants?
RH: My only theory is that the only people who had 24/7 access to the elevator shafts was the elevator maintenance company.
They did a lot of their work after hours. They inspected rails and all the interiors of the shaft for safety reasons. A team of men working from an elevator that they control could have access from the top to all the interior columns from the inside. There’s no way there could have been access from the outside, because people would have noticed. But inside, at least two or three sides of each column were exposed and could be penetrated by a drill or something to insert some form of explosive [with a remote-controlled blasting cap].
Richard Humenn P.E.- WTC Chief Electrical Design Engineer
First the shills say the truthers have no credibility. Then when a credible person talks on the matter, they say "oh they are as goofy as the truthers"
There is no telling a shill the truth they have believed the lie way to long..