LRDG Ford F30 front vents information

[Charlie Down]

I'm trying to find information on these LRDG Ford F30 front vents. Are they standard vents relocated from behind the small grills, or added in base workshops? They don't seem to be anything to do with the engine air intake, or cooling system, so were they vents to the cab foot wells. We know the cabs were very hot places to be in the desert, as the crew had the heat of the engine added to the ambient air temperature, so was this some attempt at adding cooling for the crew? They are fitted to the majority of trucks, Any ideas or photos would help!