Help identifying channel balance.

A quick learner from Roslyn, NY says:
I have to replace the channel balances on a few of my Fiberlux non tilt vinyl windows. I measured the balance to be 20" as you showed in the video. The search showed the replacement to be a 20" Series 350 balance. My balance has a 19 D stamp on it and I'm not sure how to figure the sash weight in order to purchase the correct replacement. Please advise. Thanks
Profile picture of Paul
Paul from SWISCO responded:
A stamp of "19 D" usually corresponds to our 1940 option, but you can always weigh your sash to confirm.
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.