channel balance I.D.

A quick learner from Orlando, FL says:
I am hoping you can help me identify a channel balance I need to replace. It appears to be a series 380 but it does not have the typical numbers stamped on the side. It has the following code in purple ink on the side: 29 9 GW CMC 7.

Sam L
Profile picture of Donna
Donna from SWISCO responded:
Hi Sam,
The stamp options indicate the strength of the balance. Please remove the window sash and place it on a scale. We need the weight of the window sash (the balances are holding) in pounds to suggest a stamp option.
A quick learner from Orlando says:
Hi Donna,
The window sash weighs 31 lbs. The channel balances are series 380, 30" long.
Thanks, Sam
Profile picture of Donna
Donna from SWISCO responded:
Hi Sam,
Choose option 2950.

S380-30 with stamp option 2950 is designed to carry a window sash weight range of 28 through 32 pounds.

This 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.
Reply to Thread
Use this form to ask a follow-up question or to share your experience regarding this subject.
(your email address will be kept private and is only used to inform you when a response has been made)
Current wait time is 4-7 business days
We promise that one of our experts will personally get back to you as soon as they are able. Thank you very much for your patience and understanding. If your inquiry is time-sensitive, please feel free to reach us at 856-317-6263 or at