Channel Balancer Weight Ratings

A quick learner says:
Do you have a scale for window weight ratings for the S373-30 channel balancer options?
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Donna from SWISCO responded:
The weight ranges for the 30" Series 373 are as follows

2910 will carry a window sash weight range of 7 through 12 pounds
2920 will carry 12 through 16 pounds
2930 will carry 16 through 23 pounds
2940 will carry 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.
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