Tom from SWISCO responded:
June 29, 2021
Hello! We can absolutely custom make this configuration for you. Based on the weight of your sash, the 28C stamp would definitely be too weak. The weight range is for the sash and glass; basically everything that the balances are designed to support. I have no idea why the original installers put in such a weak balance for such a heavy window, but it happens. I will email you a purchase link and price quote now for two balances made to this configuration. Let me know if you had any questions or wanted to make any changes. |