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>muh wooden doors
Delousing chambers in Auschwitz used wooden doors made gas-tight by felt stripes. Pic related is one such wooden gas-tight door in the delousing gas chamber of Block 1 in the main camp.

The possibility of using wooden doors for Zyklon B delousing chambers was described by the engineers G. Peters and E. Wüstinger of the firm Degesch (the producer of Zyklon B) in 1940 ("Sach-Entlausung in Blausäure-Kammern", Zeitschrift für hygienische Zoologie und Schädlingsbekämpfung, 1940, vol. 32, issue 10/11, p. 193):
>The chambers should be kept as narrow as possible in order to ensure a sufficiently safe and gas-tight construction for the doors provided at both ends, also those made of wood; if possible, the doors should also have steel frames and the sealing surface (rubber profile or elastic felt strip) should rest on them. In addition to the suitability of the fumigation equipment, the tightness of these doors is of course a decisive factor for successful killing.

The usual denier claim that wooden doors somehow cannot be made gas-tight is debunked by the brute fact of the delousing gas chambers having used such wooden doors (for gassings of likely higher HCN concentrations and longer durations). And no, the other argument, that such a door cannot withstand the crowd pressure, doesn't hold water:
http://holocaustcontroversies.blogspot.com/2013/10/viewers-guide-to-auschwitz-surprising.html#doorpressure