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Casey from SWISCO responded:
January 29, 2018
Good question. If your channel balance should not have a stamping/marking that is like our stamped options, the only other way to confirm the sash weight would be to weigh your window sash. Remove the sash and weigh it on a scale. From there, you would use the sash weight range chart located on the respective product page and correspond the sash weight to the appropriate stamping. Get back to us if you should need any further help.
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