Channel Balance code for Weight

A home owner from California says:
June 21, 2016
The number on the channel is 36DS for one window and the other window is 33DS

the picture in the 351 series looks very close, just not sure of the weight
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Tom from SWISCO responded:
June 22, 2016
To help us calculate the best spring strength option for you could you weigh your sash on a scale and let us know what is weighs? Thank you!
37" Series 351 Channel Balance
37" Series 351 Channel Balance
S351-37
$13.34
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