Residential windows

A quick learner from Arizona says:
Looking for replacement balances for my windows. Numbers on channel balance is 33-3. Needing 12.
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Casey from SWISCO responded:

Hello,

With this combination of attachments, you could have either an S380-34 or S385-34 channel balance. You’ll need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. You'll also need 3330 spring strength options for your replacement balances.

Thank you and let us know if you have any other questions or concerns.


Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.
A quick learner says:
I have series 380?how do I know what 3330 spring strength options I should choose?
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Casey from SWISCO responded:

Great, you'll see multiple strength options to choose from on the S380-34 product page. Based on the 33-3 stamp printed on your metal balance channel, you'll need the 3330 strength option to support a sash weight between 18 and 23 lbs. 

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