Sash weight?

A handy person from orinda , ca says:
I'm ordering a pair of channel balances. I'm doing this for someone else, so I don't have access to the window right now. The channel balance is the 21" and 1/2 " width version, but I forgot to look for the sash weight option stamp. The window is 15" x 21" and appears to be a fiberglass frame. Can you tell me the approximate sash weight?
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Paul from SWISCO responded:
The 2020 may be what you want. Two balances with this option can carry a sash weight of 8 through 12 pounds. That said, this is an educated guess. I cannot guarantee that it will work for you. Weighing the sash is the only reliable way to check.
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