I need help with an idea...

[Toby's my baby]

Maybe if you used screen, and a non-strong magnet?? I don't know... Sorry, good luck with it though!

[Karen]

A screen on a hinge that swings both ways would allow cats in and out, but keep bugs out. Like a swinging door, but vertically swinging instead of horizontally.

[slleipnir]

Can't seem to get around the fact that the screen doesn't move...(IE, the whole window needs to come off before the screen will...)

[Glacier]

We just cut the screen--along the bottom and up a few inches on the side. Kitties can get through and the bugs stay out. They love their enclosure. Even the seniors use it occasionally. Boots is out there more than he is in the house!

[mruffruff]

There are screen doors for cats in the DrsFosterSmith.com website. They are made to put into a window screen.

I would use chicken wire for your enclosure (in fact, I did in mine). The cats may be able to tear screening and escape when you aren't looking.

[Kfamr]

Could you install a kittie door in the window?

[slleipnir]

My dad keeps insisting bugs will get in....urg...