window channel balance

Question

window channel balance: (06/05) UNIQUE 13-C-30
14 inch long metal channel.
I emailed earlier and got some info but I cannot decide which style it is, S390 or S351

User submitted photos of a window balance.

Paul · Accepted Answer

It's tough to say. It depends on the depth (heel-to-toe measurement) of your bottom shoe. The difference is subtle, so it's hard to eyeball, but yours might be the 15-001, which is 1-1/8" deep. If it is, then our Series 390 would be the better choice.