Question for camper converted Berlingos

[Berl]

Hi, when using the Berlingo for sleeping in how do members ensure adequate ventilation?
The obvious answer is to leave a window slightly ajar but depending where you are this could attract the attention of undesirables.
Is there any possibility of fitting vents in the rear inner plastic liners then through to the wheel arches somehow?
Just a thought, but this is something I would like to do myself.

I think that in the past you said you had window deflectors fitted? Could you not just crack the front window open 1/2 inch that should give reasonable security.

Failing that something like :-

http://www.ebay.co.uk/itm/UNIVERSAL-CAR-...1713916234

but I think they would leave the window open quite wide.

Unfortunately these sort of window grills don't work on the berl window because the front windows have the verticle gap.....