Unique stamped S 770 balance

Home Owner from Florida
I have used your 28" 770E balance for all my windows, but not for this size sash. I just ordered 4 of the 22" 770E, but cancelled when I looked at the markings- they are as follows in the single quotes: ' (2/90) UNIQUE 21-F 60' I measured it at 22". If I need custom, so be it, please advise. Thank you.
4 Replies
Tom
Tom from SWISCO
SWISCO
Expert
Thanks for posting! It looks like your balance may need to be custom made. Before we begin, though, I'd first like to confirm the weight of your sash. Based on your stamp, I want to recommend the custom option of 22F, which can support a sash weight range of 27 through 30 pounds. However, can you tell me if your window sash weight falls within that range?

Please keep in mind that the weight range 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.
Home Owner from Florida
Thanks Tom. The sash weighs 35 pounds.
Tom
Tom from SWISCO
SWISCO
Expert

Oh, I see. In that case, you will need the 22H stamp, which can support 34 through 37 pounds. I'm going to email you a custom order link and price quote for your review. You can use this to place an order on our website. Please let me know if you have any other questions.

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