Channel Stamp Options

A home owner from Dover, FL says:
My balance channel is stamped 28D USB, what option should I use.
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Casey from SWISCO responded:
You may need the 2840 option, weight the window sash to check.
The 2840 will carry a window sash load weight range of 23 through 28 pounds.

This information is based on 2 balances per sash. Balances are designed assuming friction in the jamb weather-strip will carry a portion of the sash weight. Suggested sash weights are approximate.
A home owner from Palm Coast, FL says:
Hello, my ch. balance is stamped 29 9 BX CMC 10, what should I use.
Thanks.
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Tom from SWISCO responded:
You may need the 2950 stamp option. However, in order to determine the series of the balance, you will need to identify the shoes that are attached.
Please reply to this discussion with pictures.
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