need to identify full channel replacement for a single hung window

Question

I have some single hung windows that need full channel replacements. Beginning with the smaller ones first. The stamp on the channel is "3210" with "B.S1" and "OK". (picture attached). The window is 22 years old, manufacturer "Atmos Corp.", sticker shows "Series 630 SH" and "H-R25-48x72"

Tom · Accepted Answer

Thanks for your photos. Based on what I see here, you have either our S351-33 or S390-33, depending on the depth of the bottom shoe. That's the only difference between them. I recommend measuring your shoe and referring to our dimensions to confirm the best match.

Comparison of the S351 and S390 balance shoes.