Stamp 2850 balances?

A home owner from California says:
Are heavier duty 29 inch channel balances available from Swisco. I have ordered online from Swisco and was very satified. New E2R double glazed windows are heavier than standard double glazed -hence the need.
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Casey from SWISCO responded:
Yes, 2850 stamp option is available at SWISCO.

2850 will 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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