Nuair Window Channel Balance replacement needed

A quick learner from Palm Harbor, FL says:
March 12, 2012
Hi: I need to replace a Nuair window balance that appears to be your part # S380-35. There are no stamping in the balance frame just the markings - 34 9 DX CMC 2. It is from a single hung non tilt Nuair window and the metal channel is 35" long and 9/16" wide. Please confirm the correct replacement part #. See images attached.
A customer submitted photo of channel balance attachments.
Profile picture of Tom
Tom from SWISCO responded:
March 12, 2012
Thanks for posting. Can you please tell us the weight of your sash? This will help us determine the appropriate stamp option.
A quick learner from Palm Harbor, FL says:
March 14, 2012
The sash weighs 31.6 lbs
Profile picture of Donna
Donna from SWISCO responded:
March 14, 2012
35" Series 380 with stamp option 3450 will carry a window sash weight range of 30 through and including 34 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 help@swisco.com.