Sash Weight Range

A quick learner from Ottawa, Canada says:
the balance in my window, shows a stamp that says 18A
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Tom from SWISCO responded:
Thanks for posting. I see you were looking at our S351-19 . Is this what you have? If so, I recommend the 1810 option. A stamp of "18A" usually corresponds to this. That said, you can always weigh your sash to confirm.
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