Side Load Balance

A quick learner from California says:
Need to replace the side load balance on several windows. All appear to be the same Jeld Wen aluminum double pane single hung windows.
Part Information stamped #2030D
Length of metal component minus ends is 21".
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Emily from SWISCO responded:

Hi there!

It looks like you have either our S351-21, with a 15-002 bottom attachment, or S390-21, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. You'll also need a spring strength option of 2030. 

If you have any further questions please let us know!


Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.
A quick learner from California says:
I think it is the S390 with the 12-001. That said the width of the channel looking at the open spring side is a fraction larger than 1/2 inch. Is the S390 this same width?

Randy
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Emily from SWISCO responded:

Yes, the S390's metal channel's width is 9/16", but is considered 1/2" in the trade.

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