Tom from SWISCO responded:
February 15, 2018
I agree, the S380-29 looks like the best replacement option in each case. A stamp of 28-B-20 corresponds to our 2820 option, and a stamp of 28-C-30 corresponds to our 2830. If you do not think this is right, I recommend weighing your sash on a scale to confirm its exact weight. We have a chart on the S380-29 store page you can use as a reference to pick the best option for your sash weight.
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