Tom from SWISCO responded:
December 4, 2019
Thank you for submitting your inquiry to our discussion board. Your balances look like our Series 395 channel balances, unfortunately the stamp number you have is from an outdated rating system so you will need to get the physical weight of your window in order to determine the proper spring strength. Please let us know if you have any further questions once you get that sash weight. |
Tom from SWISCO responded:
December 4, 2019
Great! So you can go ahead and replace your balance with the S395-16 with a 1550 option. Take another look and let us know if any other questions come up. |