Window balance assembly

A purchasing agent from South Florida says:
Hello I after a complete window balance assy. For impact Yale orgron windows
The balance reads 29ds -42
I don't see double spring I'm almost the 40 would work I would need to buy in bulk
Thank you
Sean
channel balances
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Tom from SWISCO responded:
I see you were looking at our S390-30 . Is this what you have? If so, can you confirm the weight of the sashes these balances support? I think it might be 42 pounds. Refer to the chart on the S390-30 store page. As you can see, there are two possible options that could work for a 42 pound sash: the 2970, which can carry a sash weight of 39 through 42 pounds, and the 2975, which can carry a sash weight of 42 through 45 pounds. I highly recommend getting an exact sash weight just to see if it leans more one way over the other.
A contractor from South Florida says:
The sash weight is 43 lbs
What I need to know is this a double spring balance/channel ? Or do you have another product / series to look at ?
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Tom from SWISCO responded:
I don't believe the S390-30 has a double spring, but the 2975 can carry a sash weight of 42 through 45 pounds. That perfectly covers your sash weight of 43 pounds.
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