Window grilles ?
Answers: I hope that the link below works, it a product that i enjoy been fitting for a quantity of years and i think that it would be just the thing for your problem.
I live in Peterborough uk and if you are not to far away, i could sort it for you (Trade price).
http://www.sws.co.uk/retractable-gates/s...
Just lock the porthole in the darkness vent mode,
that way you return with air transformation, but the gap is too small for the cat to escape.
Do you own double glazed UPVC windows? as these usually hold a night vent lock built contained by
Not the best idea, but if you obtain chicken wire and fix it surrounded by, it could help??
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