nuair 900 series

Hey, thanks for posting. I've narrowed this down to two possible channel balance Series: either our Series 380 or our Series 385 balances.

Now, as you can see, there is only one difference between these two Series, and that is their bottom shoe. The Series 380 uses the 15-005 while the Series 385 uses the 15-004. I can't quite tell what you have based on your pictures, though. Please carefully compare their dimensions to your own hardware and see which is a better match. As for the top sash guide, you might want to consider our 18-178 and see how well this matches with your hardware.

It looks like it's over an inch, so the Series 385 might be what you want. You should confirm just in case, though.