[2008] German Poison Gas (1914 - 1944) by  Richard A. Widmann

[Bill M. Armontrout] The 'False News' Trial of Ernst Zündel -- 1988 

The Mechanics of Gassing by Robert Faurisson

Quotes
After the execution, the ammonia was released and the gas expelled out of the chamber. All staff and witnesses were removed from the area. The ventilation fan ran for approximately an hour before two officers equipped with Scott air-packs (self-contained breathing apparatus which firemen use to enter smoke-filled buildings) opened the hatch of the gas chamber and removed the lead bucket containing the cyanide residue. The two officers wore rubberized disposable clothing and long rubber gloves. They hosed down the condemned man's body in the chair, paying particular attention to the hair and the clothing because of the cyanide residue, then removed him and placed him on a gurney where further decontamination took place. The officers then hosed the entire inside of the gas chamber with regular cold water.
    The ventilation fan was a very powerful squirrel-cage type fan that was encased in the stack. (32-8904) Armontrout testified that he had no idea how long it would take to ventilate the gas chamber without the ventilation fan. He believed he would have to abandon the complete area, open the ammonia and air valves, and hope for enough draft to clear it. It would take many, many hours.
    On top of the gas chamber was a blower which sucked the air out of the chamber itself and expelled it into the atmosphere through a 40-foot stack. Two guard towers located near the stack had to be vacated when the gas was expelled. Armontrout testified that he would not want to expel any gas into the atmosphere unless it was well above the prison wall. The gas chamber was located at the lower level of the prison in a dead spot as far as air circulation was concerned. He believed some of the gas could hang there and be a danger to staff and witnesses.
.....Armontrout was asked about the feasibility of using gas in a room thirty metres long and seven metres wide. He replied that he believed it would be dangerous if it got loose that way. Without proper ventilation, it would be very dangerous.[Bill M. Armontrout] The 'False News' Trial of Ernst Zündel -- 1988 

[2008] German Poison Gas (1914 - 1944) by  Richard A. Widmann So, the story goes, that on one hand, the Nazis were using Zyklon B to delouse the camps and thereby prevent the spread of typhus, while on the other hand they were using the same agent to kill the very inmates whose lives they were attempting to save......Based on the development of sophisticated poison gases including Tabun and Sarin, and their manufacture in huge quantities, the official Holocaust story appears absurd.[21]  Holocaust historians have yet to answer the question why the Nazis would not have used Tabun or Sarin had they wanted to carry out an extermination of the Jews. .....Had the Nazi leadership wanted to exterminate the Jews of Europe, they had far more sophisticated and lethal means to carry out such a plan.  The official Holocaust gassing story requires a suspension of reason and a belief in the absurd.

Killing someone in a gas chamber is very dangerous for those who carry out the execution, above all because the body of the dead prisoner is saturated with lethal gas. After the execution, explains Leuchter (p. 98), "You go in. The inmate has to be completely washed down with chlorine bleach or with ammonia. The poison exudes right out through his skin. And if you gave the body to an undertaker, you'd kill the undertaker. You've got to go in, you've got to completely wash the body."
    Bill Armontrout, warden of the Missouri State Penitentiary in Jefferson City, confirms the danger (p. 102): "One of the things that cyanide gas does, it goes in the pores of your skin. You hose the body down, see. You have to use rubber gloves, and you hose the body down to decontaminate it before you do anything [else]." (Armontrout also testified as an expert witness in the 1988 Zündel trial in Toronto, confirming Leuchter's expertise as America's foremost gas chamber specialist.)
    Gas chambers shouldn't be used at all, says Leuchter (p. 13): "They're dangerous. They're dangerous to the people who have to use them, and they're dangerous for the witnesses. They ought to take all of them and cut them in half with a chain saw and get rid of them." Of the five execution methods used in the United States, he prefers electrocution because it is the least painful, least problem prone, and least costly. [1998] Probing Look at 'Capital Punishment Industry' Affirms Expertise of Auschwitz Investigator Leuchter

It should also be remembered that a man may be overcome by the absorption of hydrocyanic gas through the skin; a concentration of 2 percent hydrocyanic acid gas being sufficient to thus overcome a man in about 10 minutes. Therefore, EVEN IF ONE WEARS A GAS MASK, exposure to concentrations of hydrocyanic gas of 1 percent by volume or greater should be made only in case of necessity and then FOR A PERIOD NO LONGER THAN 1 MINUTE AT A TIME. In general, places containing this gas should be well ventilated with fresh air before the wearer of the mask enters, thus reducing the concentration of hydrocyanic gas to low fractional percentages.
......Unfortunately I must say in their defense that even some intelligent technicians and even some well-informed chemists imagine that almost any small place can easily be transformed into a homicidal "gas chamber." None of those people has had the chance to visit an American gas chamber. They would understand the enormity of their error. The first Americans who thought about executing a condemned man by gas also imagined that it would be easy. It was when they tried to actually do it that they understood that they risked gassing not only the condemned man but also the governor and the employees of the penitentiary. They needed many years to perfect a nearly reliable gas chamber. FOREWORD to The Leuchter Report -by Dr. Robert Faurisson