SWISCO - The Replacement Hardware Authority

which is the correct replacement

A quick learner from Florida says:
My channel is stamped with a 28B what is the correct replacement, does the 28B also identify the top and bottom clip numbers or is the 28B just for the channel.
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Paul from SWISCO responded:
The 28B is the spring sash weight option. It doesn't tell us the balance series. The 28B is our weight option 2820 for a sash weighing between 12-16 lbs.
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