Let air in but keep the cat inside?

[Disneyblueeyes]

I have double French doors in my kitchen which I'd love to keep open for some fresh air. However, I have an indoor cat and the only place to put her litter tray is in the utility, which she'd have to cross the kitchen for. Because of that, I can't just shut the kitchen door and keep her out or she'll wee everywhere.
Is there something I can buy that can go over the door frame which will allow the air to come in, but stop the cat getting out?
I was looking at one of those magnetic fly things but I'm doubtful it will stop the cat (then again she is quite fat and lazy so not sure she'll even bother trying).

Thanks.

www.flatcats.co.uk/window-protection-what-are-flat-cats.php

Would this be of help? It looks like they make them for doors as well.

I made window coverings like the ones @45degrees has linked to

you can order the mesh and the hook and loop from Amazon. I’m lazy so after sticking the fabric to the hook and loop I stapled it in place, took about 15mins per blind

We have 2 indoor cats and they’re quite happy with it, wish I’d done it years ago it wax a god send in the hot weather and stopped any wasps getting in so I was safe (anaphylactic allergy)