Correct, most armoured vehicles had an extractor fan to remove the fumes from the guns.
There should be some sort of opening, to vent them, so I need to look again at those drawings.
I know for sure that Humber A/C had a variety of arrangements for the different Mk's with a small opening on the side covered with an armoured "box" and the fan housed the other side again in an armoured "box" with an opening at the bottom.
Amazing work Colin, I am in absolute awe.
Through your endeavours, in my own small way I have managed this.
Thanks.
George.
