Window Channel Balances

A home owner from Central Florida says:
I need a pair of balances for 21year old Kinco single hung non-tilt window. Your series 351-15 looks like a good fit except my balances are stamped 2440BB and elsewhere B.S.I.

Can you supply the correct balances for this window? Pictures are attached.
User submitted photos of a window balance.
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Tom from SWISCO responded:
Thanks for posting! Before I recommend anything for you, can you first confirm what bottom shoe you have? Series 351 uses our 15-002, but it looks like you have our 15-001. Compare their dimensions to what you have and let me know. If you have a 15-001 after all, then you may be looking at our S390-15.

The stamp is indicative of your balance's strength. Yours corresponds to our 2440 option, but you may want to double check your sash weight to make sure it matches the rating shown for the 2440.
A quick learner from Central Florida says:
I double checked the bottom shoe and it is a 15-002 (1 inch vs. 1 1/8 inches). So the Series 351 looks correct to me. I only see four weight codes for the 15 inch 351, they are 1410, 1420, 1430, and 1440. Is it possible to order a pair of Series 351s with weight code 2440 (the sash weighs 25.5 pounds and I don't see a place that converts sash weights to codes)? I don't see any way to add another option.
Thank you
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Tom from SWISCO responded:
Ah, I see. I should have noticed this before. Usually a balance with a stamp of 2440 is actually 25" long, not 15". If your balance channel is only 15" long, the stamp would be more like 1440. But the 1440 option can't support anywhere near 25.5 pounds.

You might want to double check just in case, since there isn't a 15" long channel that can support a 25.5 pound sash. It's a pretty heavy sash for such a short channel.
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