31" Ballast

A landlord from San Francisco says:
May 31, 2023
30 A is stamped on the ballast
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Lauren from SWISCO responded:
June 5, 2023

Hello, thank you for posting,

It looks like you have either our Series 351, with a 15-002 bottom attachment, or Series 390, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. You will need to measure an undamaged version to get an accurate measurement.

For a 31" balance, the 30A stamp should translate to a 3010 stamp option that can support a 7 to 12 lb window sash. Please compare. 

Let us know if you have any additional questions. 

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.
31" Series 351 Channel Balance
31" Series 351 Channel Balance
S351-31
$11.52
31" Series 390 Channel Balance
31" Series 390 Channel Balance
S390-31
$11.30
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