Flyzzz Adjustable Sliding Window Ventilating Screen, Aluminum Frame Anti Mosquito Window Screen for Rolling Doors and Windows (15.74 Inches High By 21-40 Inches Wide, B)

Well, before I had the chance to finish putting it in place, my lot came along and decided that it didn't need any further intervention or adjustments! I think they've given this a thumbs up too, haha.It not only keeps the flies out, but allows me to keep the window open whilst keeping my lot in! It's sturdy, well made and does the job!

Well there was me looking for a fly screen to cover large sash windows and these were here all the time. These will be a godsend when we finally get some sunshine (UK weather permitting). Just extend them to suit and pull the sash window down to sit neatly on top. Done. No fuss, no muss.

item is much more flimsy than I expected - it does the job though

Easy to install. Thick felt surround ensures no gaps. Fine mesh stops rain getting through. Solid build. Kept out all flies after install. But let in cool air during hot nights. Great investment.

I'm not sure how I lived my life before this contraption. It is perfect for what I needed it to be. They show demonstrations of this thing being horizontal, but I use it in a vertical configuration. Works absolutely perfectly. I would buy 10 more of these if I needed to. So easy to put into place and take down. It's amazing!

Great product, great fit, it’s like plug&play. Highly recommended it and would buy it again.

Fits any of our windows, so excellent to be able to move them around as needed. Excellent value!

I have a cat and would like to have my window open more without the fear of him jumping out.I didn’t wanna spend $ on a full screen installation right now but needed something for the time being. This is perfect.I live in an older building and the windows are about 4 inches taller than this screen fully extended but it’ll do for this spring 💕

These little window screens don't seem as common or as easy to find as they used to be, but they are very useful not only for screenless windows but also as a kind of secondary screen to protect the original window screen from being torn by cats. I could not find a screen for the smaller of my windows - but this fits just right and has cushioning around the edges to protect them. It seems to be of good quality.