Help choosing the correct channel balance

Thanks for posting. Since your top attachment has wings, and your bottom attachment does not, your balance will have to be custom made. We do not have any standard Series that match this configuration.

Before we begin, though, I'll have to figure out what your bottom shoe is. Please look at the measurements for our 15-001 and 15-002 bottom shoes and note their depths. As you can see, they are 1-1/8" deep and 1" deep, respectively. Which measurement more closely resembles your own shoe?

Thank you! Now, I just have one last question. There should be a stamp printed on your metal channel. Could you tell me what it reads?

Are you sure it doesn't read 17-4? With a metal channel length of only 18", the stamp should not read 27-4! Please confirm and let me know.

Oh, I see. Then you would want the S390-28, instead. I would also recommend the 2740 option, which can carry a window sash weight range of 19 through 26 pounds. Does your sash's weight fall within this range?

Please keep in mind that the weight range information is based on 2 balances per sash. Balances are designed assuming friction in the jamb weather-strip will carry a portion of the sash weight. Suggested sash weights are approximate.