Aluminum window channel balances

Question

Hi, the channel balances on a single hung aluminum window has failed. Based on your parts identification guides and steps, I believe the correct replacement parts would be 17 inch series 351 option 1620 - the window weighed 8.6lbs, no markings visible on the failed balances. Can you confirm from these images?

Jasmine · Accepted Answer

Thanks for reaching out! It appears that your balances could be either the S351-17, as you've identified, or the S390-17 with a 1620 stamp. This stamp is rated to carry 8 to 12lbs.

To determine the correct series, you'll need to confirm the measurement for the depth of your bottom shoe. It should either be 1" or 1-1/8". Take a look at the diagram below for reference.

Comparison of the S351 and S390 balance shoes.