Does anyone have any good recipes for thanksgiving?
Google on 'adjustable window screen'Perhaps one of those would work for youOtherwise, I'd fashion a frame out of wood or pvc pipe and cover it with screen meshThen I'd hold it in place with something other than tapeAny tape you use will leave a residuePerhaps a binder clip or two would do.
you don't need screening if you just have air flow they shouldn't come in have a little fan of some sort blowing out the windowshould work.