channel balance I.D.

A quick learner from Orlando, FL says:
I am hoping you can help me identify a channel balance I need to replace. It appears to be a series 380 but it does not have the typical numbers stamped on the side. It has the following code in purple ink on the side: 29 9 GW CMC 7.

Thanks!
Sam L
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Donna from SWISCO responded:
Hi Sam,
The stamp options indicate the strength of the balance. Please remove the window sash and place it on a scale. We need the weight of the window sash (the balances are holding) in pounds to suggest a stamp option.
A quick learner from Orlando says:
Hi Donna,
The window sash weighs 31 lbs. The channel balances are series 380, 30" long.
Thanks, Sam
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Donna from SWISCO responded:
Hi Sam,
Choose option 2950.

S380-30 with stamp option 2950 is designed to carry a window sash weight range of 28 through 32 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.
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