About this detail of the Tiger
This is a small sample from a photograph showing an 'initial' Tiger, numbered '100', captured by the Russians and put on show.
It clearly shows a full set of mesh screens on the engine deck air vents. The larger screen is lifted slightly. Another photograph of a Tiger from this group (page 38) clearly shows mesh screens.
Thanks to Robert Price for pointing this out.
[1] "Tiger I & II; combat tactics", Tom Jentz, Schiffer Military publications