BSI 2020

Question

I need 4 channels. These are marked BSI 2020. They are 21" long measured without the plastic end pieces and are 1/2" wide. Thank you

Ed

Jasmine · Accepted Answer

Thanks for writing in! Your channel balances appear to be either the S351-21 with a 1" shoe or the S390-21 with a 1-1/8" shoe. To determine which series is needed for your window. Look over the dimensions from the diagram below to confirm the depth of your bottom shoe. You'll need to select the 2020 stamp.

Comparison of the S351 and S390 balance shoes.