Hi Tom,
Thank you for the information. After checking the spec. it would be the series 380.
how about the sash weight range:
the old sash has a number "26-5" Picture #1.
What should I order "19 to 26" or "26 to 30", this is a heavy windows for noise reduction.
Thanks, Juan
A stamp of 26-5 often corresponds to our 2650 option, but the only way to know for sure is to weigh your sash and compare that weight to our chart.