The pressure differential described is usually a key component of NBC protection systems.
PLA Next Generation Main Battle Tank
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It also doesn't have the crew in the turret anymore, so smoke can't bother the crew. Same thing with the Armata.
Because you need to release the pressure, otherwise that toxic stuff still penetrates into the driver's module in complex battle conditions. The best practice is always extract it in a way that will lower the temperature and reduce the infrared footprint.
Will it though? The crew capsule should be air tight with NBC protection meant to keep stuff like this out.
Armata evacuates excess gass built up in the turret when it ejects the spen't stub through the turret side. I don't see yet a way to eject spent cases through Type-100 turret.It also doesn't have the crew in the turret anymore, so smoke can't bother the crew. Same thing with the Armata.
At least the prototype still has fume extractor, probably just covered by the sheath.
It could also be that prototype is equipped with a normal 105mm gun.