[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.  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.

James Roth, director of a laboratory in Massachusetts, then testified on the analysis of the 32 samples, the origin of which he was unaware of: all the samples taken in the homicidal "gas chambers" contained a quantity of cyanide which was either unmeasurable or infinitesimal, while the sample from the disinfection gas chamber, taken for comparison's sake, contained an enormous amount of cyanide (the infinitesimal quantity detected in the former case can be explained by the fact that the supposed homicidal gas chambers were in fact morgues for preserving bodies; such morgues could have been occasionally disinfected with Zyklon B).The Zündel Trials (1985 and 1988) by ROBERT FAURISSON

The only area in Birkenau which indicated any blue staining was Delousing Facility No. 1, from which control sample 32 was removed. [Fred A. Leuchter] The 'False News' Trial of Ernst Zündel -- 1988 

Felderer showed a slide of an outside wall of the delousing building in the women's camp which indicated a significant blue colour. Felderer was told by Auschwitz officials that the blue staining resulted from the use of Zyklon B. (19-4383) Felderer believed the colour got on the walls when mattresses which had been deloused inside the building were then taken outside for airing, leaned against a wall and beaten for a length of time to get any Zyklon B out of the material. The powder material which was the inert carrier of the Zyklon B would stick to the wall and produce the distinct blue colouration. Felderer noted that this blue colour was not found in the alleged gas chamber at Auschwitz at all. (19-4383, 4384)
    The delousing buildings, which were not open to the public, contained autoclaves used to decontaminate materials using steam. (19-4384, 4385) Rooms inside the building also indicated blue staining, which Felderer concluded was authentic and not simply painted on afterwards. Felderer told Zündel that the discovery of the delousing buildings was a tremendous step in their investigation. The blue staining was the Zyklon B mark and it was astonishing that this colour was not found in the buildings where it was claimed people were gassed to death using Zyklon B. (19 4376, 4387, 4388)
    Posters on the walls of the delousing building warned inmates that "One Louse Means Your Death" and "To be Clean is Your Duty." Felderer testified the Nazis were very fearful of lice because they brought great epidemics into the camps. (19 4392)  [Ditlieb Felderer] The 'False News' Trial of Ernst Zündel -- 1988 

Exhaust system (lack of)
[Right] The gas chamber at Parchman, Miss, seen from the outside. It is isolated from other buildings. Note the pipe for the exhaustion of the gas. There are no such pipes in the alleged German chambers, nor is there any trace or any such pipes. http://www.cwporter.com/bild2.htm

One must ask how, for example in the case of Auschwitz II or Birkenau, one could bring 2,000 people into a room measuring 210 square meters in area, and then in this highly crowded situation throw in the very strong pesticide Zyklon B, and then immediately after the deaths of the victims let a work crew without any gas masks enter the room in order to take out the bodies which had been thoroughly saturated with cyanide.
    Two documents [8] from the German industrial archives which were registered by the Americans at Nuremberg tell us that the Zyklon B had a strong tendency to adhere to surfaces and could not be removed from an ordinary room with a strong ventilator, but only by natural aeration for almost 24 hours.
    Additional documents may be found only at the site in the Auschwitz Museum archives, which were never described elsewhere, but which show that this room of 210 square meters, which is today in a dilapidated condition, was only a very simple mortuary, which (in order to protect it against heat) had been located underground, and which was provided with only a single door which served as both an entrance and an exit. [2005] The Problem of the Gas Chambers By Robert Faurisson 2005

    [Krema I] The alleged gas chamber area had no exhaust system for removing the gas. It simply had three vents in the roof. Assuming the area was used as a gas chamber, it would take the better part of a week to air it out before any humans could go in to remove anything that was inside the chamber area. (32-9071)
    There were two drains in the area that was alleged to be the gas chamber. These drains were tied into the main drainage system of the camp. Leuchter testified that if the area were utilized as a gas chamber, liquid condensed hydrogen cyanide gas would get into the drains, mix with the water and eventually wind up coming out every storm drain and possibly every sink drain and toilet in the camp. The drains made the room a very dangerous place to utilize as a gas chamber. (32-9068; Photograph of drain on the floor of the alleged gas chamber at Krema I entered as part of Exhibit 145).....Leuchter testified that he knew from the inspection of the facility that there was no ventilation system at Krema II of any type and no provision in the construction of the building for any. (32-9273) [Fred A. Leuchter] The 'False News' Trial of Ernst Zündel -- 1988 

In Holocaust literature, the vents were allegedly used as the openings to drop in the Zyklon B, which produced the hydrogen cyanide gas after it reached the floor of the facility. Zyklon B was a special preparation of hydrogen cyanide gas where the gas was forced by compression into particles of chalk or wood pulp. These particles carried the gas and would, upon heating or being exposed to air, release the gas into the area where the gas was to be utilized. One of the main requirements for driving or evaporating the hydrogen cyanide gas out of the Zyklon B was excessive temperature. It had to be heated to above 78 or 79 degrees Fahrenheit. If the temperature was not near the 78 degree point, it would be released much slower and over a much longer period of time. Leuchter pointed out that of the four vents, one was in the area of a washroom and not in the presumed gas chamber at all. The alleged gas chamber room was extremely cold and damp. [Fred A. Leuchter] The 'False News' Trial of Ernst Zündel -- 1988