Weight rating for 29 9 balance

A quick learner from san Jose CA says:
I have aluminum single hung windows made by milguard on or about 1990
channel length 30"
" Width .50"
series 380

the stamp reads 29 9 ET CMC 2

I need to know the weight rating
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Paul from SWISCO responded:
I'm afraid "29 9" doesn't match any of our existing options. The best way to confirm which of our standard S380-30 options will work is to weigh your sash and regard the chart we have on the S380-30 store page.
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