Channel balance weight stamp

A quick learner from Fountain valley,ca. says:
Its 33 C.
What is the weight?
Length is 34"
I believe that my channel balance is 351 series
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Tom from SWISCO responded:
Thanks for posting. With a stamp of 33 c, I recommend the 3330 option. As you can see, this can support a window sash weight of 18 through 23 pounds. Does your window's sash fall within that range?

Please keep in mind that the weight range 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.
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