When enemy armored force vehicles are attacked at close quarters with
incendiary grenades, the air louvres are very vulnerable. It is therefore
important that differentiation be made between "inlet" and "outlet "ducts, since
obviously a grenade thrown against an exhaust opening will be less effective than
one aimed at an inlet, which will draw the inflammable liquid into the vehicle. If
the engine is not running, all openings are equally vulnerable.
In general, it may be said that in the Pz Kw II and III tanks the best
targets are the flat top-plates of the rear superstructures, since the air intakes
are located there. The side louvres in these tanks are invariably protected by a
vertical baffle. On the Pz Kw IV, the left side ports are intake and
thus more vulnerable than the right-hand exhaust ports.