Balance Channel Marking

A home owner from Richland, WA says:
My channel is stamped 26 4. Is this the same as option 2640 of series 385? All other parts look the same. Thanks!
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Tom from SWISCO responded:
Yes, usually a stamp of 26 4 corresponds to our 2640 option. I recommend weighing the sash as well, though, just in case.
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