channel balance

A home owner from California says:
I am a bit confused by the weight chart...

My window weighs 15 pounds on the scale...
2 new channels at 7 + pounds each ?
or 15 for each side? Thanks
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Tom from SWISCO responded:
When considering what option to choose, it's assuming both balances are supporting that weight. So if your sash is 15 pounds, you need our 2920 option.
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