The Holocaust denier Germar Rudolf published an article on "The Thin Internal Walls of Krematorium I at Auschwitz" with supposedly "far-reaching consequences" - summed up as yet another nonsensical slogan: "No doors, no destruction".
Rudolf argues that the internal walls of the crematorium were "unable to support the installation of massive steel doors". Even if - for the sake of argument - the internal walls of the crematorium were too weak for a "massive steel door", there is no reason the Nazis had to have used a "massive steel door" in the first place. The screwing shut mechanism mentioned by witnesses does not point to "massive steel fixtures", as Rudolf presumes, but to the makeshift gas-tight strong wooden doors pictured in Pressac's Technique and Operation of the Auschwitz Gas-Chambers (see also Rebutting the "Twitter denial"). Nothing suggests, let aside proves, that these doors and their anchoring could not withstand the pressure from inside the homicidal gas chambers (Viewer's Guide to "Auschwitz - The Surprising Hidden Truth").
The homicidal gassings in the crematorium in Auschwitz main camp are demonstrated by numerous pieces of evidence (e.g. Rebuttal of Mattogno on Auschwitz, Part 2: Gas Introduction at the Crematoria). It does not 'hinge' on the gas-chamber's door. There is no indication that the gas-tight wooden doors produced in the camp's workshop could not do the job for the provisional crematorium 1 gas chamber (or any other, for that matter).