Replacement window channel balances

Question

I need two balances.. I want to make sure I order the correct one.. the only markings are 29 9 BSI. I have enclosed a picture of the markings also.. thank you

Tom · Accepted Answer

Initially, this looks like the S350-30 channel balance, but the top attachment is so mangled that I can't tell. Is the other balance from the same window in better shape? Is there another window with the same balances that you can look at? See if you need S350-30 and get back to us. You will also need to weigh your window sash, so remove it and do that before you report back.