window channel balance

A home owner from Morristown, TN. says:
2030 21" long 1/2"wide
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Depending on the depth of your bottom balance shoe, you have either S390-21, with a 1-1/8" depth bottom fitting, orS351-21, with 1" depth shoe.
Comparison of 15-001 & 15-002
Comparison of 15-001 & 15-002
Your spring weight option would be 2030.
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