To facilitate rapid distribution of carbon monoxide, without pressure build-up, two 10-centimeter vents will be made at the top of the rear wall. These vents will be fitted with adjustable metal valves.
Para poder introducir rapidamente o dióxido de carbono evitando a sobre-presión faranse dúas fendeduras de dez centímetros no tabique traseiro, ... provistas de válvulas móbiles con bisagra de folla de lata.