This is an example of where the archives (shout out to Califangers!) Pay off.
https://archive.codohforum.com/20230609 ... ml?t=12465
From post #3 we get what Pressac said;
"The question of capacity of the crematories at Auschwitz-Birkenau is answered in an internal memo written by Prüfer on 8th Sep 1942, and bearing the heading 'Reichsführer SS, Berlin-Lichterfelde-West, Krematorium Auschwitz: Confidential and Secret!' The memo states that the three double-muffle ovens of Crematory I could cremate 250 bodies daily, the four triple-muffle ovens of Crematory II 800 daily; those of Crematory III likewise 800; the two four-muffle ovens of Crematory IV 400 daily; and those of Crematory V likewise 400. Theoretically this gives a total capacity of 2,650 bodies per day, which was never realized. This memo, written by the best known German cremation specialist of the time, shows that the total cremation capacity of 4,756 bodies per day, as stated by Auschwitz Central Building Administration in report for Berlin dated 28th June 1943, is greatly exaggerated."
I would have pulled directly from 'technique', but, my copy isn't searchable and I haven't gotten around to feeding it through any 'OCR'.
Here lamprecht discusses the Zentralbauleitung document in the OP.
https://archive.codohforum.com/20230609 ... ml?t=12778
Mattogno handles it on page 341 of his book linked above ("9.6. Discussion of the Zentralbauleitung Letter of 28 June 1943").
I'll pull the quote from 'furnaces' unless someone beats me to it.
From page 341;
At the end of the preceding subchapter, we left in suspension the technical examination of the cremation capacity as indicated in the Central Construction Office letter of 28 June 1943. Now, having ruled out – in terms of economy and duration – the efficient simultaneous cremation of multiple corpses in one muffle in the Auschwitz-Birkenau Furnaces, we can state with certainty that such a capacity is technically impossible. This judgment is strengthened further by the fact that, as we shall see in Chapter 10, the minimum theoretical fuel requirement of a Topf triple-muffle or 8-muffle furnace for the type of corpse which demanded the lowest amount of fuel was 16 and 12 kg of coke per corpse, respectively. In view of the fact that the furnaces of Crematoria II and III of Birkenau could burn (35 kg/hr/hearth ∙ 2 hearths/furnace ∙ 5 furnaces ∙ 24 hr =) 8,400 kg of coke in 24 hours and those of Crematoria IV and V (35 kg/hr/hearth ∙ 4 hearths/furnace ∙ 24 hr =) 3,360 kg, if the Crematoria II and III did in fact have a capacity of 1,440 corpses in 24 hours, the average coke consumption per corpse would have been a mere (8,400÷1,440=) 5.83 kg; for Crematoria IV and V, a capacity of 768 corpses in 24 hours would have meant an average consumption of only (3,360÷768=) 4.37 kg of coke, but such figures would be only about one third of the minimum theoretical requirements. The capacity indicated in the letter of 28 June 1943 is, therefore, technically impossible to attain. How can we explain this dilemma?
Of course, Mattogno continues, but, for brevity, I dock the quote here.