What option to use for s380-29

A handy person from Yorba Linda Calif says:
The S380-29 looks to be the sash i need my window wieghs 30LBS i think the option 2850 will work what part# should i use. Don
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Tom from SWISCO responded:
Hey, Don. First, keep in mind that this hardware is called a "balance." The "sash" is the glass panel that slides up and down.

As for what option to use, two balances with the 2850 option can carry a sash weight of 28 through 30 pounds. Since your sash weighs 30 pounds, I think the 2850 is a great choice.
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