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we had some where the roller and channels were attached to the window frame immediately adjacent to the glass, so didn't interfere when the windows were open.
this was in EU land, mind - so not sure how ubiquitous they are.
they do look a bit cheap, all plastic and self-adhesive, but worked pretty well.
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How does this impact things like ventilation in the summer?
Just thinking that the time they're most needed is in the summer, and with the heat in recent summers it could cause an issue.